What mass in grams of hydrogen is produced by the reaction of 2.0 g of magnesium? (Make sure to balance the reaction first)
Mg(s) + H2O(1) --> Mg(OH)2(s) + H2 (8)

Answers

Answer 1

Answer:

0.164541341 g H2

Explanation:

1) Convert grams to moles by dividing by RMM of Magnesium (24.31g).

  2g Mg * (1 mol Mg / 24.31 g Mg) = 0.082270671 mol of Mg

2) Use the balanced equation's ratio of 1 mol Mg: 1 mol H2.

  0.082270671 mol of Mg = 0.082270671 mol of H2

3) Convert the mol of H2 back into grams by multiplying by H2's RMM (2 g).

  0.082270671 mol of H2 * 2 g H2 = 0.164541341 g H2

* Answer can be rounded to your liking *


Related Questions

Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4? A. 1.15 × 10^23 B. 1.84 × 10^24 C. 4.61 × 10^23 D. 7.87 × 10^23

Answers

Answer:

B

Explanation:

first find the no. Of moles of H2SO4

=  75/98.1

= 0.7645

Next step

In on mole of H2SO4 the no.of oxygen atom is 4.

1 H2SO4 : 4 O

0.7645  : x                     x= 0.7645x4= 3.0581

next multiply avogadros constant

3.0581 x 6.022× 10^23 =1.84x10^24

Mass present in 1 gram of mole substance is called molar mass. Molar mass is calculated by: dividing the mass of the compound in grams by the number of moles present in the substances.

The correct answer is:

option B. 1.84 × 10²⁴

Given,

The mass of sulfuric acid =75.0 g

The molar mass of sulfuric acid = 98.1 g/mol

1.The moles of sulfuric acid can be calculated by

M = m ÷ n

where M is molar mass, m is mass and n moles.

moles of sulfuric acid = mass ÷ molar mass

= 75 g ÷ 98.1 g/mol  

=0.7645 moles

Hence moles of sulfuric acid present is 0.7645 moles.

2. 1 mole of sulfuric acid = 4 oxygen atoms.

Then, 0.7645 moles of sulfuric will contain: 0.7645 × 4 = 3.0581 atoms of oxygen

3. Oxygen atoms present in 75.0 g of H₂SO₄ will be calculated by multiplying it with Avogadro's constant:

= 3.0581 x 6.022× 10²³

= 1.84x10²⁴

Therefore, 1.84 × 10²⁴ oxygen atoms will be found in 75.0 g of H₂SO₄.

To learn more about moles follow the given link:

https://brainly.com/question/20486415

please help me please

Answers

Answer:

b

Explanation:

i read this once and remember,trust me!

Answer:

20 is b and 21 is a.

The map shows the main streams and the the rivers near City A and City B, as well as the nearby factories and farmland, The arrows in
the diagram show the direction of the water flow. City A gets its water from the sunset River and City B gets its water from the Moth Lake. A liquid herbicide was applied to a farmland. What is the greatest risk of using the herbicide?
Select One:

It will pollute the water source for the city A

It will pollute the air for the City B

It will pollute the water source of city B

It will pollute the air for the city A​

Answers

Answer:

c

Explanation:

the map shows water near the factories go into moth lake so all of the waist will end up there

Chemical reactions will occur if_____.
- the mass of the products is greater than the reactants
- the products are more stable than the reactants
- the products are the same stability as the reactants
- the products are less stable than the reactants

Answers

Answer:

the products are more stable than the reactants

Explanation:

Consider the intermediate chemical reactions.



2 equations. First: upper C a (s) plus upper C upper O subscript 2 (g) plus one half upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s). Delta H 1 equals negative 812.8 kilojoules. Second: 2 upper C a (s) plus upper O subscript 2 (g) right arrow 2 upper C a upper O (s). Delta H 2 equals negative 1, 269 kilojoules.



The final overall chemical equation is Upper Ca upper O (s) plus upper C upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s).. When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation

Answers

When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

Let's consider the following intermediate chemical reactions.

Reaction 1: Ca(s) + CO₂(g) + ½O₂(g) → CaCO₃(s)    ΔH₁ = -812.8 kJ

Reaction 2: 2 Ca(s) + O₂(g) → 2 CaO(s)                  ΔH₂ = -1269 kJ

We want to calculate the enthalpy of the following overall chemical equation.

CaO(s) + CO₂(g) → CaCO₃(s) ΔH = ?

We can apply Hess' law.

What is Hess' law?

Hess' law states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.

To apply Hess' law in this case we have to:

Conserve equation 1 as is.Reverse equation 2 and multiply it by 1/2, thus changing the sign of its enthalpy and multiplying it by 1/2.Add both equations and their enthalpies.

Ca(s) + CO₂(g) + ½ O₂(g) → CaCO₃(s)    ΔH = -812.8 kJ

+

CaO(s) → Ca(s) + ½ O₂(g)                       ΔH = 634.5 kJ

--------------------------------------------------------------------------------------

CaO(s) + CO₂(g) → CaCO₃(s)                  ΔH = -178.3 kJ

When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.

The complete question is as follows.

Consider the intermediate chemical reactions.

Ca (s) + CO₂ (g) + ½O₂ (g) → CaCO₃ (s) ΔH₁ = -812.8 kJ

2Ca (s) + O₂ (g) → 2CaO (s) ΔH₂ = -1269 kJ

The final overall chemical equation is

CaO (s) + CO₂ (g) → CaCO₃ (s) ΔH = ?

When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation

is halved and has its sign changed. is halved. has its sign changed. is unchanged.

Learn more about Hess' law here: https://brainly.com/question/11628413

Answer:

Consider the following intermediate reactions.

                              CH₄(g)+2O₂(g)⇒CO₂(g)+2H₂O(g)           ΔH₁ = -802 kJ

                              2H₂O(g)⇒2H₂O(I)                                     ΔH₁ = - 88 kJ

The overall chemical reaction is as follows.

                              CH₄(g)+2O₂(g)⇒CO₂(g)+2H₂O(I)             ΔH₂ = -890 kJ

What is the correct enthalpy diagram using the Hess law for this system?

✔️ A←

❌ B

❌ C

❌ D

Could somebody answer these questions for me? Thanks!

1. What percentage of the earth is covered by water?

2. What sorts of signals does the brain use to communicate sensations, thoughts and actions?

3. Did dinosaurs and humans ever exist at the same time?

4. What is Darwin's theory of the origin of species?

5. Why does a year consist of 365 days and a day of 24 hours?

Answers

Explanation:

1) %70 earth is water and %30 is land.

2)" The single cells in the brain communicatethrough electrical and chemical signals.

3) b'coz earth revolve around the sun in365 days and rotates on its axis in 24 hours. It takes 365 days , because it takes that much time to complete one revolution and it takes 24 hours,because it takes time to complete one rotation as mercury takes 81 earthdays to complete one revolution.

4) Human originated from Adam And Eve.

A sample of air has a volume of 140.0 mL at 67C. To w
hat temperature must the gas
be lowered to reduce its volume to 50.0 mL at constant pressure?​

Answers

Answer:

What that means is that when pressure and number of moles are kept constant, increasing the temperature will result in an increase in volume. Likewise, a decrease in temperature will result in a decrease in volume. In your case, the volume of the gas decreased by a factor of about 3, from "140.0 mL" to "50.0 mL".

Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air + water = food for plants

Answers

Answer:

sunlight

Explanation:

Discribe how an internal combustion engine works. What is drawback to the type of power?

Answers

Answer:

An internal combustion engine is a heat engine in which the combustion of a fuel occurs with an oxidizer in a combustion chamber. The force of combustion is converted into mechanical energy through the use of levers and gears. The by products of combustion include energy, water vapor, carbon dioxide (CO2), nitric oxide (NO), nitrogen dioxide (NO2), and carbon monoxide (CO). The two primary drawbacks to the internal combustion engine are the primary energy source is non-renewable (fossil fuels) and the by products can have damaging effects on the environment.

Explanation:

Which has more total Heat Energy/
A.) A cup of HOT coffee
B.) A thermos of HOT coffee
C.) They both have the same amount to heat energy

Answers

Answer:

The thermos should have more heat energy because of the greater mass.

Please help No Explanation needed. Its science please

Answers

Answer:

C, A, A, B, B

Explanation:

Question 5: C. continental drift

Question 6: A. new rock forms

Question 7: A. happens at deep-ocean trenches

Question 8: B. convection currents in the mantle

Question 9: B. convergent boundary

why do we see only one side of the moon from earth?

Answers

Answer:

The moon's period of rotation and revolution are equal

does gravity affect the orbit of the international space ​

Answers

Answer:

yes

Explanation:gergrgregbfbwerbebw

During light-dependent reactions, carbon dioxide is converted to glucose.

Group of answer choices

True

False

Answers

Answer:The light-independent reactions use the ATP and NADPH from the light-dependent reactions to reduce carbon dioxide and convert the energy to the chemical bond energy in carbohydrates such as glucose.

Explanation:step-by-step

Answer:

FALSE

Explanation:

I just took the test and put true and it was wrong so it's false. Hope this helps and please mark brainliest!

what is the compound of libr

Answers

Answer:

Lithium Bromide

Explanation:

Answer:

El bromuro de litio es un compuesto químico de litio y bromo. Su carácter higroscópico extremo hace que LiBr sea útil como desecante en ciertos sistemas de aire acondicionado.

Explanation:

What are many earthquakes intended to do?

Answers

Answer:

rapid shaking of the earth, caused by the breaking and shifting of underground rock. Earthquakes can cause buildings to collapse and cause heavy items to fall, resulting in injuries and property damage.

Explanation:

Answer:

They tend to cause mass destruction, even destroy lots of building. I hope this helps you out.

Explanation:

How many moles of NaCl are contained in 100.0ml of a 0.20m solution

Answers

M= 0.20 M
V= 100.0 ml = 0.100 L
n= ??

M = n/v

:. n = MV

n = 0.20M x 0.1000L

:. n = 0.020 mol

I’ll give Brainliest to the first answer
The amount of elements on the reactants side of an isolated equation are ___________ the amount of __________ that are formed on the ________ side. *
A)close to, ice crystals, cold
B)less than, properties, chemical
C)equal to, elements, products
D)similar, molecules, present
E)more than, elements, products

Answers

Answer:

C. equal to, elements, products

Explanation:

I took a quiz and it said this was right

A chemistry student mixes 25 milliliters of 3.0 M hydrochloric acid (HCl) with excess sodium hydroxide. The chemicals react according to this chemical equation:

HCl + NaOH → NaCl + H2O.

If the volume of the resulting solution is 68 milliliters, what is the concentration of sodium chloride?

Answers

Answer:

1.1 mol/liter

Explanation:

You would use the M1V1 = M2V2 equation to solve this.

We know M1 is 3.0 M, V1 is 25 milliliters, and V2 is 68 milliliters. We need to find M2.

To find M2, first plug in what you know.

(3.0 M)(25 mL) = M2(68 mL)

Then, divide everything by 68 mL to get M2 by itself

Your answer should be a quite large decimal but I rounded it to 1.1 mol/liter.

Answer:

The concentration of sodium chloride is 1.1 moles/liter.

Explanation:

in a titration 20.0 mL of 0.150 M NaOH(aq) Solution exactly neutralize is 24.0 mL of an HCl solution what is the concentration of the HCl solution

Answers

Answer:

0.125

Explanation:

i took a test and got it right choosing this answer hopes this help

which term names a small icy object that orbits the sun?

Answers

Answer:

It a comet

Explanation:

that why they are also called dirty snowballs

Answer:

A comment

Explanation:

Because I took the test and that 100 and because comets are icy and sometimes lead tale of water droplets behind them

Question 2 options: The Galápagos tortoises are native to seven of the Galápagos Islands, a volcanic archipelago about 620 miles west of the Ecuadorian mainland. With lifespans in the wild of over ____________years, it is one of the longest-lived vertebrates. A captive individual lived at least ______________years!

Answers

Answers:

in the wild of over 100 years,...

A captive individual lived at least 255 years!

Explanation:

The giant Galapagos tortoises (Chelonoidis nigra) are famous because this species was observed by Darwin during his travel. This species is native from the Galapagos Islands and currently is in danger of extinction. Galapagos tortoises are recognized as one of the longest vertebrates. In this regard, it is worthy to note that a giant tortoise named Harriet lived 255 years, this specimen was in the Australian Zoo.

Please help

What causes a wave to have a higher amplitude?

Answers

Answer:

More energy

Explanation:

Wave amplitude is determined by the energy of the disturbance that causes the wave. A wave caused by a disturbance with more energy has greater amplitude.

Answer:

energy of the disturbance

Explanation:

........ btw bts paved the way I saw you was army and thought I would say that

How many mL of 0.5 M H2SO4 will neutralize 10 mL of 1.5 M NaOH?

0.75mL

30 mL

3 mL

15 mL

Answers

Answer:

15 mL

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this answer can help you. Have a nice day!

Explain why matter takes space

Answers

Due to the exclusion principle and other fundamental interactions, some "point particles" known as fermions (quarks, leptons), and many composites and atoms

Determine whether these statements describe Geiger counters, scintillation counters, both, or neither. An amplifying device that indicates the presence of ionizing particles A device that permits determination of alpha and beta radiation emitted from a substance Film sensitive to radiation that is removed and developed to measure exposure A device used for monitoring individual cumulative exposure to ionizing radiation

Answers

Answer:

An amplifying device that indicates the presence of ionizing particles  

GEIGER COUNTERS

A device that permits determination of alpha and beta radiation emitted from a substance  

BOTH

Film sensitive to radiation that is removed and developed to measure exposure  

NEITHER

A device used for monitoring individual cumulative exposure to ionizing radiation  

NEITHER

Explanation:

1. Geiger counters and scintillation counters can be described by statements 1 and 2.

2. Statement 3 refers to film-based radiation detectors, not Geiger counters or scintillation counters.

3. Statement 4 refers to dosimeters, not Geiger counters or scintillation counters.

1. An amplifying device that indicates the presence of ionizing particles: This statement describes both Geiger counters and scintillation counters. Both types of counters use amplifying devices to detect and indicate the presence of ionizing particles.

2. A device that permits determination of alpha and beta radiation emitted from a substance: This statement describes both Geiger counters and scintillation counters. Both types of counters are capable of detecting alpha and beta radiation.

3. Film sensitive to radiation that is removed and developed to measure exposure: This statement describes neither Geiger counters nor scintillation counters. Instead, it refers to film-based radiation detectors, such as photographic film or thermoluminescent dosimeters (TLDs), which are used to measure radiation exposure.

4. A device used for monitoring individual cumulative exposure to ionizing radiation: This statement describes neither Geiger counters nor scintillation counters.

Know more about ionizing particles:

https://brainly.com/question/12206417

#SPJ2

1. Why is hot air hot?

Answers

Answer:

Explanation:

Radiation from the sun heats the ground, then the ground heats the air by process of conduction. When that happens air temp. and density start to change causing air convection currents. Hope I help.

Consider the nuclear equation below. Superscript 222 subscript 86 upper R n right arrow superscript 218 subscript question mark upper P o plus superscript 4 subscript 2 upper H e. Which is the missing value that will balance the equation? 84 86 88 90

Answers

Answer:

84

Explanation:

From the question given above, it is evident that 222 86Rn is emitting alpha particle since the daughter nuclei produced has a mass number lesser than 4 when compared to parent element.

Therefore, the miss value in the equation is 84.

Please see attachment for further details

Based on the calculations, the missing value that will balance the equation is: A. 84.

What is an alpha decay?

An alpha decay is a type of nuclear reaction in which the atomic nucleus of a radioactive element emits an alpha particle (helium atom), thereby, producing chemical elements with a different atomic nucleus.

In this exercise, we are given the following nuclear equation with an alpha decay:

²²²R₈₆   -----> ²¹⁸Poₓ + ⁴He₂

For the subscript, we have:

86 - 2 = 84.

Read more on alpha decay here: brainly.com/question/23303931

#SPJ2

What is the general word equation for salt formation by neutralization?
a. Metal + nonmetal
b. Acid + metal
c. Base + nonmetal
d. Acid + base

Answers

Answer:d. Acid+base

Explanation:

Because, The general word equation for salt formation by neutralization is acid + base = salt + water.

Answer:

D ACID + BASE

Explanation:

5. What is the % of each element in Al2(Cro4)3? ​

Answers

Explanation:

Utiliza mayúsculas para el primer carácter en el elemento y minúsculas para el segundo carácter. Ejemplos: Fe, Au, Co, Br, C, O, N, F.

Puedes utilizar los paréntesis () o los corchetes [].

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