Chem 2 test 3 flashcards

question

A Sample of Helium gas at 745 torr and 45*C has a volume of of 80.0ml. What pressure is needed to Compress the volume of this sample at 35*C to half?
answer

P1= 45 Torr

T1=    318 K

V1=      .08

T2=    308K

V2=      .04

 

1.44 x 10^3 torr

question

Calculate the number of grams of ammonia in a gas sample at 765 torr and 32*C if the volume is 76.5 ml?
answer

n=PV

    RT

 

.0522 g NH3

 

 

question

Given the reaction

Ca(OH)2 + 2HCL –> CaCl2 + 2H2O

 

Calculate the molarity of the HCL solution if a 0.435 gram sample of Ca(OH)2 required 26.8mL of acid to reach the end point.

answer

0.435g Ca(OH)2|1 mole Ca(OH)2|2mole HCL|.01174

74.08g|1mole CaCl2| 0.0268 L

 

3.15 x 10^-4m

question

A gas has a molar mass of 48.0g/mole. Calculate the volume , in liters, of a sample weighing 3.67 grams, at STP
answer

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question

How many grams of Sodium Chloride are needed to prepare 456 ml of a 10.2% solution?
answer

10.2g|456.ml

100ml

 

46.5 g

question

How many milliliters of 14M sulfuric acid are needed to prepare 2.50 L of 0.340M solution?
answer

question

How many grams of Potassium sulfate are contained in 450ml of 0.450M solution?
answer

0.450M|.45L|174.06 K2SO4|

                    L    |      |1 mole K2SO4           

35.2 g of K2SO4 

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