Answer:
calcium oxide CaO
hope it helps
10.00g of hydrated sodium sulfate decomposes to form 4.40g Na(2)SO(4).xH(2)O -> NaSO(4) + xH(2)O of anhydrous sodium sulfate on heating. What’s the formula mass of hydrated sodium sulfate and the value of x?
please help i have no clue!
X=10
Explanation and workout is in the photo attached with this answer
The formula mass of hydrated sodium sulfate is Na₂SO₄.10H₂O. The value of x is equal to 10.
What is the mole concept?A mole is the amount of substance containing the same number of elementary entities as the number of atoms present in a pure sample of any element.
A mole is also described as the amount of a substance that contains 6.022×10²³ fundamental entities of the given substance.
The mole concept is a convenient method of representing the amount of a substance.
Given, the mass of the hydrated sodium sulfate = 10.0g
The mass of the anhydrous sodium sulfate is produced = 4.40g
Mass of the water evaporated as water on heating = 10.0 - 4.40 = 5.6g
The number of moles of water = 5.6/18 = 0.31 mol
Similarly, the number of moles of sodium sulfate = 4.4/142.04 = 0.031 mol
The ratio of the number of the moles of the sodium sulfate and water:
[tex]\frac{n(H_2O)}{n(NaSO_4)}=\frac{0.31}{0.031} = 10[/tex]
Therefore, the ten moles of water will be evaporated for the one mole of sodium sulfate. Therefore, the formula mass is Na₂SO₄.10H₂O.
Learn more about the mole concept, here:
https://brainly.com/question/22540912
#SPJ2
water is formed when 48g of oxygen combine with 6g of hydrogen. what mass of oxygen combines with 2g of hydrogen
Answer:
16g of oxygen reacts with 2 g of hydrogen to form 18g of Water
8 Fe + S8 → 8 FeS, how many moles of iron (Fe) are needed to react with 8.49 moles of sulfur (S8)?
Based on the balanced equation, the mole ratio of Iron to Sulphur is 8 to 1.
This means that for every mole of sulfur, 8 moles of iron is needed for the reaction.
∴ since the moles of Sulfur = 8.49 moles
⇒ moles of Iron = 8.49 moles × 8
= 67.92 moles
Calculate the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy.
Q = mcΔT
The specific heat of water is 4.18 J/g°C.
Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= 1800 J c= 4.18 [tex]\frac{J}{gC}[/tex] m= 5 g ΔT= ?Replacing in the expression to calculate heat exchanges:
1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT
Solving:
1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT
ΔT= 86.12 C
In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.
Learn more:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsWhich contains more atoms, 10. 00 g of aluminum or 10. 00 g of lead? Can you explain without using mathematical conversions?.
Explanation:
divide the weight in grams by the atomic mass from the periodic table, then multiply the result by Avogadro's number..
Hope this works!!
How does Bone Marrow Donor Program work?
Name some diseases that can be cured by bone marrow transplant.
What is Donors’ Registry Program?
noooooooooooooooooooooo
When a substance is heated ,the kinetic energy of its molecules
Answer:
When a substance is heated ,the kinetic energy of its molecules also increase.
Explanation:
K.E is directly proportional to T
I really need help. Forgot to do m assingment and it's due tomorrow
Answer:
im only good at math
Explanation:
Don't really understand the question
Answer:
Did they mean those diagrams are the salt or what?
What is the formula for titanium (I) dichromate?
Use proper capitalization.
Enter subscripts as big numbers. For example: Water is entered H2O
How might a molecule have a very strong molecular dipole?
Answer:
When you make the electronegativities of A(Positive partial charge) and C (Negative Partial charge) less and have B with a strong electronegativity to create a very strong molecular dipole. ... Both molecules possess strong molecular dipoles.
What can you say about the reactants of photosynthesis and the products of cellular respiration?
Answer:
The reactants of cellular respiration are oxygen and sugar, which are the products of photosynthesis
Explanation:
This table displays which one is it A. Price values of the metals ,B. Physical properties of the metals ,C. Chemical properties of the metals ,D. Corrosive resistance of the metals
Answer:
b the physical components
How are exo- and endothermic reactions different? Give an example of each.
Answer:
In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system. A popular example of an endothermic chemical reaction is photosynthesis.
(i searched in g o o gle)
Water is continuously changing state and moving from place to place in the water cycle. This diagram shows these processes and movements. (Bro there's no science AHHHH)
Answer: bro- i have no idea wat science that is but heres the water cycle-
Which phrase describes properties of a solid?
O A. Changing shape and fixed volume
B. Changing shape and volume
c. Fixed shape and volume
D. Fixed shape and changing volume
Please help I’ll give brainlist jut fast please!!!
Answer: fixed shape and volume
Explanation:
i took the quiz so its right
What occurs as potassium nitrate is dissolved in a beaker of water, indicating that the process is endothermic?
(1) The temperature of the solution
decreases because heat was
released.
(2) The temperature of the solution increases because heat was absorbed.
(3) The solution changes color.
(4) The solution gives off a gas.
A piece of copper alloy with a mass of 85.0 g is heated from 30. °C to 45 °C. In the process, it absorbs 523 J of energy as heat. What is the specific heat of this copper alloy?
plz help me and answer this xx
Answer:
410.196 J/[kg*°C].
Explanation:
1) the equation of the energy is: E=c*m*(t₂-t₁), where E - energy (523 J), c - unknown specific heat of copper, m - mass of this copper [kg], t₂ - the final temperature, t₁ - initial temerature;
2) the specific heat of copper is:
[tex]c=\frac{E}{m*(t_2-t_1)}; \ => \ c=\frac{523}{0.085*(45-30)}=\frac{523}{1.275}=410.196[\frac{J}{kg*C}].[/tex]
.
Approximately now much energy will it take to
break all the bonds present in the molecule below?
Answer:
498 kj/mol
Explanation:
Chemical reactions occur as a result of bond breaking and bond formation.
The bonds in reactants are broken and atoms are rearranged to form new bonds.
During bond breaking energy is absorbed to break the bonds of reactants while bond formation involves the release of energy during the formation of new bonds.
In our case;
In 1 mole of the Oxygen molecule, there is one O=O bond
Energy absorbed to break O=O is 498 kJ/mol
Therefore, the ΔH required to break all the bonds in one mole of Oxygen(O₂) molecules is 498kJ/mol.
Note that, bond breaking is endothermic since energy is absorbed from the surroundings.
mark brainliest pls
how long does it take to rehydrate after being dehydrated
Answer:
up to 120 minutes to digest water and rehydrate your body
6. How many grams of barium chloride are produced when 1.25 x 10power23 molecules of HCl reacts with barium according to the following equation?
word equation: HCl + barium --> barium chloride + hydrogen
formula equation: 2HCl + Ba --> BaCl2 + H2
given: 1.25×10^23 molecules HCl
Find: g BaCl2
given#moleculesSubA × 1molSubA/6.022×10^23 moleculeSubA × #molSubB/#molSubA × g SubB/1molSubB
The mass of barium chloride produced is 21.6 grams.
What is barium chloride?It is an inorganic compound with the chemical formula BaCl₂.
The equation: HCl + barium --> barium chloride + hydrogen
The chemical equation : 2HCl + Ba --> BaCl₂ + H₂
Given the 1.25×10²³ molecules HCl
First, we calculate the amount of HCL
Amount of moles of HCl=
(1.25×10²³ molecules × 1 mole)/ 6.023×10²³ atoms
=0.2075 moles.
Then the number of moles is multiplied by the molar mass of barium chloride
208.24 g/mol × 0.2075 = 21.6 grams.
Thus, the mass of barium chloride produced is 21.6 grams.
Learn more about barium chloride, here:
https://brainly.com/question/15296925
Is cobalt(II)oxide ionic or covalent
[tex]\small{\green}\fcolorbox{blue}{cyan}{\bf{\underline{\red{\color{red}Answer}}}}[/tex]
[tex]{\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Ionic}}}}}}}}}}}}}[/tex]
The compound cobalt(II)oxide is an ionic compound.
An ionic compound is a composed composed of a metal and a nonmetal. Hence the compound is actually an ion pair. The ion charges in the compound must be balanced.The compound cobalt(II)oxide is composed of a metal (cobalt) and a nonmetal (oxygen) hence the compound cobalt(II)oxide is an ionic compound.Hence, the fact that cobalt II oxide is comprised of a cation and an anion means that it us an ionic compound.
Learn more about ionic compound:https://brainly.com/question/9167977
Suppose that you experimentally determine the molar extinction coefficient (ε) of a complex ion sample to be 8171 L/mol-cm at 510 nm. The literature value for the ε of the complex ion sample is reported as 8400 L/mol-cm. What is the percent purity of your experimental sample
The percent purity of your experimental sample is 97.3 %
The percentage purity % = impure value/pure value × 100 %.
Actual value of molar extinction coefficient = impure value = 8171 L/mol-cm, pure value = literature value = 8400 L/mol-cm.
Substituting the values of the variables into the equation, we have
% purity = 8171 L/mol-cm/8400 L/mol-cm × 100 %
% purity = 0.9727 × 100 %
% purity = 97.27 %
% purity ≅ 97.3 %
The percent purity of your experimental sample is 97.3 %
Learn more about percentage purity here:
https://brainly.com/question/17836636
Word Equation for Magnesium reacting with Iron Chloride
Answer:
3Mg+2FeCl3------------3MgCl2+ 3Fe
Help with this question which I attached a picture of
[tex]\huge\underline\mathtt\colorbox{cyan}{A. Element L}[/tex]
Explanation:
Because the unidentified element has exactly the same Bright-Line Spectra of wavelength in nanometeres as does element L.
[tex]\huge\bold{\purple{\bold{⚡BeBrainly⚡}}} [/tex]
Identify what the conjugate acid/base would be. FOR KOH?
Answer: As K+ is a very weak conjugate acid of KOH, hence it has no ability to react with either OH– ion or with water molecules ions.
Explanation: Name of Molecule Potassium hydroxide
Chemical formula KOH
pH value 12 to 13
Conjugate acid K+
please help pick more then one answer!!!
Select all the correct answers.
How will the results of the Human Genome Project benefit the future of genetics? (Select all that apply.)
A. Scientists can develop better diagnostic methods for genetic diseases.
B. Scientists can successfully prevent the occurrence of genetic diseases in humans.
C. Scientists can prevent the process of human aging.
D. Scientists can compare the genomes of humans and other different organisms.
E. Scientists can produce organisms more superior than humans.
Answer: A. B.
Explanation:
Identify what the conjugate acid/base would be. FOR H3PO4?
Two pendulums colliding are example of?
Answer:
it should be an Elastic collision
balance CHCl3 + O2 = CO2 + H2O + Cl2
Answer:
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
Explanation:
Left Hand Side(LHS)
We have CHCl3 and O2
Right Hand Side(RHS)
We have CO2, H2O and Cl2
Balancing
To make sure that they have same values, put 2 before CHCl3 giving 2CHCl3 and 3 on Cl2(RHS) for chlorine gas giving 3Cl2
H2O remains the same
Before CO2 put 2 giving 2CO2
To make sure that oxygen is balanced put 5/2 before it. This gives 5/2 O2 (2 cancels out don't worry)
Combining all;
2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2
I hope this helps. Have a nice studies.
