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Unit-5 Test

Multiple Choice
Identify the choice that best completes the statement or answers the question.
Here is Data Booklet
 

 1. 
Which route must be used to change moles into volume (STP) by following?
a.
moles > mass>volume
b.
moles>volume
c.
moles>particls>volume
d.
moles>molar mass>volume
 

 2. 
What ratio shold be used to change mole to mass?
a.
1 mole/molar mass
b.
molar mass/ 1 mole
c.
molar volume/1 mole
d.
1 mole /molar volume
 

 3. 
What volume is occupied by one mole of any gas at STP?
a.
22.4 L
b.
22.4 mL
c.
6.02 x 1023L
d.
6.02 x 1023 mL
 

 4. 
How many moles of H are there in empirical formula of compound consisting of 80.0% of C and 20.0% of H?
a.
2
b.
3
c.
4
d.
5
 

 5. 
How many moles of N are there in empirical formula of compound consisting of 58.5% C, 7.3% H and 34.1% N?
a.
1
b.
2
c.
3
d.
4
 

 6. 
A gas has the empirical formula CH2. Of 0.850 L of the gas at STP has a mass of 1.59 g. what is the molecular mass of the gas?
a.
14
b.
28
c.
42
d.
56
 

 7. 
Which is molar concentration?
a.
moles of solute/volume(L) of solution
b.
mass of solute/volume(L) of solution
c.
moles of solute/volume(L) of solvent
d.
moles of solute/volume(mL) of solution
 

 8. 
What should be put first in flask to make solution?
a.
solute
b.
solvent
c.
does not matter
d.
solution
 

 9. 
Equal volume of  0.25 M HCl and 0.25 M NaCl are mixed, what would be NaCl concentration in the mixutre?
a.
0.12
b.
0.25
c.
0.37
d.
0.50
 

 10. 
What is density of oxygen at STP?
a.
0.71
b.
1.43
c.
1.4
d.
none
 

 11. 
How many moles of H and O are there in 1 mole of H2O?
 moles of Hmoles of O
a22
b11
c12
d21
a.
a
b.
b
c.
c
d.
d
 

Numeric Response
 

 12. 
How many moles of CuCl2 contain 1.2 x 1023 atoms of Cl?

 

 13. 
How many moles of O atoms do you have when you have 1.20 x 1025 N2O5 molecules?

 

 14. 
What is the mass of 1.2 x 1025 molecules of CO?

 

 15. 
What is mass of  2.50 mol of H2SO4?

 

 16. 
Calculate the molar mass of Ga2(SO3)3

 

 17. 
What is the volume occupied by 0.2625 moles of solid silver if it has a density of 10.5 g/mL? (4 marks). Answer should have mL unit.

 

 18. 
The density of a gas is 2.58 g/L at STP. Calculate the molar mass of the gas. (4 marks)

 

 19. 
Calculate the percent by mass of water (H2O) in strontium hydroxide octahydrate, Sr(OH)2.8H2O. (Answer should have 3 significant figures.)

 

 20. 
Calculate the mass of potassium carbonate (K2CO3) needed to make 400.0 mL of a 0.200 M solution of K2CO3.

 

 21. 
What volume of water needs to be added to 50.0 mL of 6.00 M H2SO4 in order to bring the concentration down to 2.50 M?

 

 22. 
A 200.0 mL of 0.450 M NaOH solution is diluted to a total volume of 1.00 L. Calculate the final concentration of NaOH.

 



 
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