Project #36453 - chemistry homework

 

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1. A sample of helium gas has a volume of 325L at 25C and at 5atm. At what temperature the gas can be compressed at 50atm to a volume of 125L?

 

2. The volume of a gas is 435ml at 25C and at 740mmHg. What would be its new volume at STP?

 

3. How many moles of argon gas are present in 70L of volume with a pressure of 180atm at 21C?

 

4. What is the % mass/volume (%W/V) of KOH in 60ml of a solution that contains 5gm of KOH?

 

5. How many moles of KBr are there in 35.8ml of a 0.172M solution?

 

6. How many grams of NaOH are there in 2.5L of a 0.343 M solution?

 

7. What volume of a 0.34M MgCl

2 solution is required to make 250ml of a 0.10M solution by dilution?

12

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8. How would you prepare the following solutions?

 

a) 2% NaCl (w/v)

 

b) 0.35M glucose

 

c) 0.12M CaCl

2

 

9. Calculate the molar concentrations for each of the following solutions:

 

a) 1.5g NaCl in 100 ml solution

 

b) 1.5g K

2Cr2O7 in 100 ml solution

 

c) 5.55g Na

2SO4 in 125 ml solution

 

d) 20g MgBr

2 in 250ml solution

 

10. Concentrated HCl is 12M. What is the molarity of an HCl solution prepared by diluting 10ml concentrated HCl to a total volume of 250ml?

 

11. What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

 

12. Concentrated nitric acid is 16M. What volume of nitric acid must be diluted with distilled water to prepare 5L of 0.1M nitric acid?

Subject Science
Due By (Pacific Time) 07/26/2014 10:00 pm
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