Question

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. The temperature at the start of the reaction was 23.0°C and at the end it was 19.0°C. Use the equation below to calculate the energy absorbed by the reaction. (Hint: the mass of the solution changes when ammonium nitrate is added.)

Answer 1

Answer:

1092 Joules

Explanation:

Answer 2

Answer:

996 Joules

Explanation:

Let the energy absorbed or lost by water to reaction be Q.

Given: mass of reaction, $m=60g$

We know, specific heat of water, $c=4.15J/g^oC$

Change in temp:

ΔT $=19^oC-23^oC=-4^oC$

Q = mcΔT $=60g*4.15J^oC*(-4^oC)=-996Joules$

The negative sign is the indication of energy being absorbed.