Chemistry questions? help now, please!!

Posted on 2017-10-18 15:56:00 in Chemistry by TOD

1. 
A piece of sodium metal undergoes complete reaction with water as follows: 
2 Na(s) + 2 H2O(l) → 2 NaOH(aq) + H2(g) 
The hydrogen gas generated is collected over water at 25.0oC. The volume of the gas is 246 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure of water at 25.0oC = 23.8 torr.) 

2. 
A gas with a volume of 530 mL has a pressure of 754 torr at 27.5oC. What would its volume be at 925 torr and 22.3oC? 

3. 
What is the molar concentration of Cl– in a 0.25 M CaCl2 solution? 

4. 
If 30.0 mL of 0.150 M calcium chloride is added to excess silver nitrate, what is the mass in grams of silver chloride produced? 
CaCl2(aq) + 2AgNO3(aq) → 2AgCl(s) + Ca(NO3)2(aq) 

5. 
A small bubble rises from the bottom of a lake, where the temperature and pressure are 8oC and 6.4 atm, to the water’s surface, where the temperature is 25oC and the pressure is 1.0 atm. Calculate the final volume (in mL) of the bubble if its initial volume was 2.1 mL. Note: 0oC = 273 K and R = 0.0821 LŸatm/KŸmol 

6. 
Calculate the density of a sample of Argon gas that has a pressure of 740 torr at 33.0oC. Note: 0oC = 273 K and R = 0.0821 LŸatm/KŸmol

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