Question

3

How much heat is required to raise the temperature of 1.5x 10³ g of water from 45°F to 130.°F? The specific heat of water is 4.184 J/g °C. 

3.0x10¹ kJ 

5.3x10² kJ 

3.0x10² kJ 

3.4x10² kJ 

8.2x10² kJ

6

When 0.7521 g of benzoic acid was burned in a calorimeter containing 1,000. g of water, a temperature rise of 3.60°C was observed. What is the heat capacity of the bomb calorimeter, excluding the water? The heat of combustion of benzoic acid is -26.42 kJ/g. 

15.87 kJ/℃ 

752.1 kJ/C 

1.34 kJ/°C 

5.52 kJ/°C 

4.18 kJ/°C

13 

The combustion of butane produces heat according to the equation 

2C₄H₁₀(g)+13O₂(g)  8CO2(g)+ 10H2O(1) DH°_rxn=-5,314 kJ/mol 

How many grams of butane must be burned to release 1.00 x 10⁴ kJ of heat? 

153 g 

219g 

61.8 g 

109 g 

30.9 g

15

A gas is compressed in a cylinder from a volume of 20.0L to 2.0 L by a constant pressure of 10.0 atm. Calculate the amount of work done on the system. 

180J 

-180 J 

-1.81 x 10⁴J 

1.81x 10⁴J 

1.01 x 10⁴J 

Answer 1

if OfWor done on the system then sign is positive

If work done by the system then Sign is negative