determine the empirical formula of the compound formed when 1.2g of magnesium reacts with 3.55g of chlorine.take the molar mass of magnesium and chlorine to be 24g and 35.5g.​

Answers

Answer 1

Answer:  MgCl2

Explanation:

Convert the masses of Mg and Cl to moles:

Mg:  1.2g/24g/mole = 0.050 moles

Cl:    3.55g/35.5g/mole = 0.100 moles

The ratio of Cl to Mg is 2 to 1:  (0.100 moles Cl/0.050 moles Mg),  Therefore there must be 2 Cl for every Mg:

MgCl2

This is the empirical formula since all we know is the ratio.  If could also be Mg2Cl4, Mg3Cl6, etc,  [i.e., (MgCl2)n]


Related Questions

The study of Environmental Science includes which of the following?

A.)human biology

B.)the relationship between the Earth and the moon

C.)interactions between humans and living and non-living things in the environment

D.)the study of organisms living in the ocean

Answers

Answer:

Hi, There! the Correct Answer is below!

C.)interactions between humans and living and non-living things in the environment

Explanation:

Environmental scientists study subjects like the understanding of earth processes, evaluating alternative energy systems, pollution control and mitigation, natural resource management, and the effects of global climate change. ... Environmental scientists bring a systems approach to the analysis of environmental problems.

____________________________________________________________

Have a wonderful Day :)

~Darkspirit~

Answer:

interactions between human and living and non living things in the environment

Which property altered during a chemical change is not altered during a physical change?

A. composition of the matter

B. temperature of the matter

C. volume of the matter

D. phase of the matter

Answers

A. composition of the matter

The property altered during a chemical change that is not altered during a physical change is composition of the matter.

A physical change is one in which no new substance is formed and it is easily reversible.

A chemical change is one that is not easily reversible and no new substance is formed. It may be accompanied by absorption or evolution of heat.

The composition of a substance changes during a chemical change  because bonds between atoms break and new bonds are formed. This does not occur during a physical change.

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b. Use the balanced equation to answer the following questions.
CuSO4(aq) + 2NaOH(aq) —->Cu(OH)2(s) + Na2SO4(aq)

i. What is the ratio of moles of CuSO4 to moles of NaOH?
ii. If 638.44 g CuSO4 reacts with 240.0 NaOH, which is the limiting reagent?
iii. Using the limiting reagent to determine how many grams of Cu(OH)2 should precipitate out in the reaction.
iv. If only 174.6g of Cu(OH)2 precipitate were actually collected from the reaction, what would the percent yield be?

Answers

Answer:

i. 1 : 2

ii. NaOH is the limiting reagent

iii. 292.5g

iv. 59.69%

Explanation:

I have the detailed and self-explanatory workings. will snap and post later. Battery percent at 15%, flashlight not working.

1. The ratio of CuSO₄ to NaOH is 1 : 2

2. The limiting reactant is NaOH.

3. The mass of Cu(OH)₂ that will precipitate out is 292.5 g.

4. The percentage yield of Cu(OH)₂ is 59.7%

1. Determination of the ratio of CuSO₄ to NaOH.

CuSO₄ + 2NaOH —> Cu(OH)₂ + Na₂SO₄

From the balanced equation above, we can see that the ratio of CuSO₄ to NaOH is 1 : 2

2. Determination of the limiting reactant.

CuSO₄ + 2NaOH —> Cu(OH)₂ + Na₂SO₄

Molar mass of CuSO₄ = 63.5 + 32 + (16×4) = 159.5 g/mol

Mass of CuSO₄ from the balanced equation = 1 × 159.5 = 159.5 g

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of NaOH from the balanced equation = 2 × 40 = 80 g

From the balanced equation above,

159.5 g of CuSO₄ reacted with 80 g of NaOH.

Therefore,

638.44 g of CuSO₄ will react with = (638.44 × 80) / 159.5 = 320.22 g of NaOH.

From the calculations made above, we can see that a higher mass (i.e 320.22 g) of NaOH than what was given (i.e 240 g) is needed to react completely with 638.44 g of CuSO₄.

Therefore, NaOH is the limiting reactant.

3. Determination of the mass of Cu(OH)₂ that will precipitate out.

CuSO₄ + 2NaOH —> Cu(OH)₂ + Na₂SO₄

Molar mass of Cu(OH)₂ = 63.5 + 2(16 + 1) = 97.5 g/mol

Mass of Cu(OH)₂ from the balanced equation = 1 × 97.5 = 97.5 g

From the balanced equation above,

80 g of NaOH reacted to produce 97.5 g of Cu(OH)₂.

Therefore,

240 g of NaOH will react to produce = (240 × 97.5) / 80 = 292.5 g of Cu(OH)₂

Thus, 292.5 g of Cu(OH)₂ precipitated out of the reaction.

4. Determination of the percentage yield.

Actual yield of Cu(OH)₂ = 174.6 gTheoretical yield of Cu(OH)₂ = 292.5 gPercentage yield of Cu(OH)₂ =?

Percentage yield = (Actual /Theoretical) × 100

Percentage yield of Cu(OH)₂ = (174.6 / 292.5) × 100

Percentage yield of Cu(OH)₂ = 59.7%

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Which of the following atoms is expected to have two unpaired electrons? 
Al
Mg
Na
None of the above​

Answers

Answer:

none of the above answers

Anyone to help me solve this question. Am going to give brainliest

Answers

copper oxide is only composed of copper and oxygen

mass of copper oxide is 4.21 grams
mass of copper is 3.74 grams
substracting the 2 values we know the mass of oxygen is 0.47 gram

the ratio of copper to oxygen can be found by comparing the mole of copper against mole of oxygen

mole of copper = 3.47 / 63.5 = 0.0589
mole of oxygen = 0.47 / 16 = 0.0294

copper: oxygen is roughly 2:1

hence the formula of the copper oxide is Cu2O

the reaction will be
Cu2O + H2 —> 2Cu + H2O

aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 344 mL

Answers

Probably 928.8 bc most of the times mass is bigger than volume and density. ( I got it by multiplying density and volume.)

Answer:

[tex]\boxed {\boxed {\sf 928.8 \ grams}}[/tex]

Explanation:

Density is the mass per unit volume of a substance. The following formula is used for calculating density.

[tex]\rho= \frac{m}{v}[/tex]

We know the density of aluminum is 2.70 grams per milliliter. The mass is unknown, but we know the piece of aluminum has a volume of 344 milliliters.

ρ= 2.70 g/mL v= 344 mL

Substitute these values into the formula.

[tex]2.70 \ g/mL = \frac {m}{344 \ mL}[/tex]

We are solving for the mass, so we must isolate the variable m. It is being divided by 344 milliliters. The inverse operation of division is multiplication. Multiply both sides of the equation by 344 mL.

[tex]344 \ mL *2.70 \ g/mL = \frac {m}{344 \ mL} * 344 \ mL[/tex]

[tex]344 \ mL *2.70 \ g/mL =m[/tex]

The units of milliliters cancel.

[tex]344 *2.70 \ g=m[/tex]

[tex]928.8 \ g =m[/tex]

The mass of the piece of aluminum is 928.8 grams.

The rate of reaction for the decomposition of hydrogen peroxide to yield water and oxygen is given by the equation: Rate = k[H202). Which of the following is indicated by this equation?

a. The rate of the reaction is unaffected by the concentration of H2O2.
b. The rate of the reaction will increase with increasing concentration of H2O2.
c. The rate of the reaction will decrease with increasing concentration of H2O2.
d. None of these

Answers

c. the rate of reaction will decrease with increasing concentration of H2O2 is false

What are precautions to be taken when doing titrations? A-Make sure to always vigorously shake that flask after every drop if the end point is still unknown. It may be that the remaining volume of the titrant needed to reach the end point is just adhering on the wall. This is to ensure accuracy. B-The amounts of solid and liquid should be weighed and pipetted with high accurac This is because all the data that will be produced will mainly depend on this. C- If the end point is unknown, dropwise addition of the titrant is recommended. D- Always make sure that the indicator is added. E- All of the above​

Answers

Answer:

E

Explanation:

This is because all steps from A-D are important to obtain an accurate result

What is the chemical formula for peracetic acid?

Answers

The chemical formula for peracetic acid is C2H4O3. This means that there are 2 atoms of carbon, 4 atoms of hydrogen, and 3 atoms of oxygen in a single molecule.

I think that the answer is C2H4O3.

When a liquid is at its boiling point, the vapor pressure of the liquid

Answers

When the liquid is at its boiling point the vapor pressure of the liquid increases

Oceanography does not include the study of which of the following topics?

A.the relationship between the Sun, Moon, and Earth

B.the relationship between the atmosphere, Earth, and the oceans

C.the Earth's oceans

D.the plants and animals that live in the oceans

Answers

Answer:

A. The relationship between the Sun,Moon,and Earth

Explanation:

What is the correct clases for this drugs

‏Compazine
heelp me please
and
Promethazine

Answers

Answer:

Compazine belongs to a class of drugs called Antiemetic Agents; Antipsychotics, Phenothiazine.


* The 'emf generated by
a copper-constantan thermometer is 15 mv. If the cold junction is at a temperature of 20 degrees celcius.Calculate the temperature of the hot junction when sensitivity
of the thermocouple is 0.03mv/degree celcius

Answers

Thermometers are used to measure temperatures. The temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

Given that:

[tex]EMF = 15mv[/tex]

[tex]T_1 =20^oC[/tex] --- Temperature at cold junction

[tex]s = 0.03mv/^oC[/tex] ---- Sensitivity

The temperature [tex]T_2[/tex] at the hot junction is calculated as follows:

[tex]T_2 = \frac{EMF}{s} + T_1[/tex]

So, we have:

[tex]T_2 = \frac{15mv}{0.03mv/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03}^oC + 20^oC[/tex]

[tex]T_2 = 500^oC + 20^oC[/tex]

[tex]T_2 = 520^oC[/tex]

Hence, the temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

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The orbit of a planet is an ellipse with the sunat one of the foci.. This is Kepler's........ second law third law first law​

Answers

Answer:

its keplers first law

Explanation:

answer from gauth math

why hydrogen has dual nature?​

Answers

Answer:

Since hydrogen has a single electron in its valence shell, it exhibits dual nature. of the periodic table, or it can obtain one electron to complete its valency of two, such as halogens from Group 17. Since it only has one electron in its outer shell, hydrogen has a dual existence.

Explanation:

This means that, like a normal halogen, a hydrogen atom can easily gain an electron to form a complete outer shell, or lose an electron to form an alkali metal. Since it already has two electrons in its outer shell, hydrogen can be diatomic, rendering it unreactive.

6. Heat from the sun reaches to us by
(a) radiation
(b) conduction
(c) convection
(d) all of these

PS. the one who gets it correct will be followed by me and also be marked as the brainliest!​

Answers

Answer:

radiation

....

.

.

.

.hi how r u

Is my answer correct

Answer:

Radiation

Explanation:

Heat from the sun reaches is by the process of radiation

draw the atomic structure of 10 elements and show Electronic configuration.......​

Answers

Answer:

Explanation:

ूअूिkzkzkksksosawwhsusisisisisisiisisisisisisiisisisis

how we can separate sand and water with the help of evaporation.​

Answers

Answer:

By filtering

Explanation:

Take one cup of mixture of sand and water , filter using a cotton cloth ,

who is th father of chemistry

Answers

Antoine Lavoisier is the father of chemistry

In a year an adult cow produces around 3.571 x 10^27 molecules of methane CH4 a greenhouse gas how many moles of methane does this cow produce in a year

Answers

Answer:

[tex]\boxed{\boxed {\sf 5930.0 \ mol \ CH_4}}[/tex]

Explanation:

We are asked to find how many moles of methane (CH₄)  a cow produces in a year. We must convert molecules of methane to moles of methane. We will do this using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance.

In this case, the particles are molecules of methane. There are 6.022 × 10²³ molecules of methane in 1 mole.

We will convert molecules to moles using dimensional analysis. Set up a ratio using Avogadro's Number.

[tex]\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}[/tex]

We are converting 3.571 × 10²⁷ molecules of methane to moles, so we multiply the ratio by this value.

[tex]3.571 \times 10^ {27} \ molecules \ CH_4 *\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}[/tex]

Flip the ratio. It is still the same value, but the units of molecules of methane cancel.

[tex]3.571 \times 10^ {27} \ molecules \ CH_4 *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} \ molecules \ CH_4}[/tex]

[tex]3.571 \times 10^ {27} *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} }[/tex]

[tex]\frac {3.571 \times 10^ {27}}{6.022 \times 10^{23} } \ mol \ CH_4[/tex]

[tex]5929.923613 \ mol \ CH_4[/tex]

The original measurement of molecules of methane( 3.571 × 10²⁷ molecules) has 4 significant figures, so our answer must have the same. For the number we calculated, that is the ones place. The 9 in the tenth place tells us to round the 9 in the ones place up to a 0, then the 2 in the tens place up to a 3.

[tex]5930 \ mol \ CH_4[/tex]

We must add a placeholder zero in the tenth place to reach 4 sig figs.

[tex]5930.0 \ mol \ CH_4[/tex]

The adult cow produces approximately 5930.0 moles of methane in a year.

Am element has 18 electrons ,20 neutrons and a charge of -2.what is the mass number?..a.38 b.40 c.32 d.39​

Answers

Answer:

Surely you must have a Periodic Table beside you....?

a=38

Explanation:

You gots Z=18, the atomic number, where Z is the number of nuclear protons. The number of protons defines the element....and thus we got calcium....

....and with 20 neutrons we got the 38Ca isotope....the which is rather short-lived...

How many inches are in 1.00 km

Answers

1 kilometer =
39370.079 inches
39370.08 inches in 1 Kilometre hi mom

PLEASE ANSWER ASAP NEED ANSWER!!!!!!!!!!!!!! 75 POINTS

Which statement about pure substances and molecules is correct?

A. Pure substances cannot be molecules.

B. All molecules are pure substances.

C. Molecules cannot be pure substances.

D. All pure substances are molecules.

Answers

Answer:

D. All pure substances are molecules.

The correct statement about pure substances is; "All molecules are pure substances."

A pure substance contains exactly the same type of atoms. In a molecule, there can only be a particular combination of atoms.

For instance, a molecule of HCl can only contain chlorine and hydrogen atoms.

This means that every molecules are also pure substances.

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How many inches are in 4.5 miles?

Answers

1 mile: 63360 inches
63360 x 4.5 = 285,120 inches
so there is 285,120 inches in 4.5 miles

Which method is used to separate the following mixture (a) water + kerosene​

Answers

Answer:

The separation of kerosene, oil, and water are immiscible liquids, so they can be separated funnel.

How can the Swartz process be modified to work for bacteria? Explain.​

Answers

Answer:

https://swartzbiotechnologylab.sites.stanford.edu/research

Explanation:

Alkyl chlorides and alkyl bromides are typically transformed into alkyl fluorides in the organic reaction known as the Swarts Reaction.

Swartz reaction?

Frederick Jean Edmond Swarts first reported this procedure in 1892. Heating the alkyl chloride or alkyl bromide in the presence of heavy metal fluorides like AGF, Hg2F2, CoF2, or SbF3 causes this reaction.

Swartz process can be used to modify work for bacteria. Bacterial biofilms are collections of microorganisms where the cells are immersed in an extracellular polymeric matrix that the bacteria have self-produced.

In contrast to planktonic bacteria, which are in a state of free movement in a bulk solution, this situation is very different.

Applications:

In this process, alkyl fluorides are created.Fluorinated aliphatic organic molecules, or Freons, are produced via a different variation of the same process.Anhydrous hydrogen fluoride is fluorinated to produce Freons in the presence of antimony salts, which exhibit the oxidation states +3 and +5.

Therefore, Alkyl chlorides and alkyl bromides are typically transformed into alkyl fluorides in the organic reaction known as the Swarts Reaction.

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calculate mass of MnO2 if 1 mole of KMnO4 completely burnt. 2KMnO4 -> K2MnO4+MnO2+O2​

Answers

Answer:  80 grams

Explanation:  

2KMnO4 -> K2MnO4+MnO2+O2​

2 moles of KMnO4 would produce 1 mole of MnO2, so 1 mole of KMnO4 would produce 0.5 moles of MnO4.  The molar mass of MnO4 is 160 g/mole.  1/2 mole of KMnO4 would therefore be (160 g/mole)*(0.5 moles) = 80 grams.

Which of the following is a feature of a Type IV flotation device?

Answers

Answer:

A Type IV PFD is an approved device designed to be thrown to a person in the water. It is not designed to be worn. It is designed to have at least 16.5 pounds of buoyancy. The most com- mon Type IV PFD is a buoyant cushion.

What is the reducing agent in the redox reaction represented by the following cell notation?
Zn(s) ∣ Zn2+(aq) ∣∣ Ag+(aq) ∣ Ag(s)

Answers

the reducing agent is Zn… reducing agent is the element/compound that undergoes oxidation

To solve such this we must know the concept of redox reaction. Therefore, Zn is the reducing agent represented by the given cell notation

Zn(s) ∣ Zn2+(aq) ∣∣ Ag+(aq) ∣ Ag(s)

What is chemical reaction?

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant. Zn is the reducing agent in the given reaction. The component that undergoes oxidation is known as a reducing agent.

Therefore, Zn is the reducing agent in the given reaction.

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Hello please I need help

Answers

It is d hope that helps!!
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