# How many joules are required to raise the temperature of 450mL of water from 30 °C to 100 °C?

The specific heat of copper metal is 0.385 J/ g- K. How many KJ of heat needed to raise the temperature of 1.1 kg block of copper from 27.5 C to 50 C?

If 200 J of heats is added to 25 g of iron at a temperature of 15 °C, what will be the final temperature?

A hot piece of iron with a mass of 75g and a temperature of 200 °C, is dropped into 250g of cool water at a temperature of 18° C. What is the final temperature of the water and the iron?

When 1.00g of sodium hydroxide is dissolved in 100 g of water in an insulated container the temperature rises from 20.0° C to 22.66° C. Calculate the enthalpy for the solution. State by assumptions made.

Calculate change in enthalpy when 100 mL of 1.0 mole/dm NaOH is added to 100 mole/dm HCl in an insulated container the temperature rises from 21.0° C to 34.6 °C.

How much heat will release when 6.44g of sulfur reacts with excess O2 according to the following equation?

2 S + 3 O2 > 2 S 3 H = -791.4 KJ

How much heat will be absorbed when 38.2g of bromine reacts with excess H2 according to the following equation?

H2 + Br2 > 2 HBr H= 72.80 KJ

An experiment was carried was carried out to determine the amount of energy released in a low fat chocolate bar with a the mass 50.0g. the complete combustion of a 10.0 g of the bar raised the temperature of 500.0g of water from 19.0° C to 86.5 °C. calculate the energy value ( KJ )of the chocolate bar.

How much heat will be transferred when 5.81g of graphite reacts with excess hydrogen according to the following reaction? Is this reaction endothermic or exothermic?