Final Review Ch. 11 (math)

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1. 
How much heat does it take to warm 16.0 grams of pure water from 90.0C to 100.0C? (specific heat of water = 4.18J/g x C)
 
669 joules
 
2. 
Calculate the energy required to produce 7.00 mol Cl2O7 on the basis of the following balanced equation: 2Cl2(g) + 7O2(g)+ 130 kcal -> 2Cl2O7(g)
 
455 kcal
 
3. 
When 1.0g of solid NaOH (change in heat os solution=-445.1 kJ/mol) dissolves in 10 L of water, how much heat is released?
 
11.1 kJ
 
4. 
When 10g of diethyl etheris converted to vapor at its boiling point, about how much heat is absorbed? (C4H10O, change in heat of vaporization=15.7 kJ/mol, boiling point: 34.6 C)
 
2kJ
 
5. 
Calculate the energy released when 24.8g Na2O reacts in the following reaction: Na2O(s) + 2 HI(g) -> 2NaI(s) + H2O(l) change in heat = -120.0 kcal
 
48.0 kcal
 
6. 
A sample of nitrogen gas at 250. kpa occupies 2.50 L. What is the neq volume if the pressure decreases to 75 kpa?
 
8.3 L
 
7. 
What is the new volume of a gas at 720 mm if the pressure changes to 2.00 atm?
 
7.1 L
 
8. 
What temperature would be required to decrease 25 L of a gas at 35 C to a new volume of 2.00 ml?
 
0.02464 K