Question

The specific heat of nitric oxide is 0.746 J/gºC. How many joules of heat are needed to
raise the temperature of 90.0 g of nitric oxide from -20 °C to -10 °C?

I don't understand how to get J​

Answer 1

Ans: 671.4 J

In nitric oxide,

Specific heat capacity (s) = 0.746 J/g°C

Mass (m) = 90 g

Initial temperature (t1) = -20°C
Final temperature (t2) = -10°C

Change in temperature (dt) = t2 - t1
= -10°C - (-20°C)
= -10°C + 20°C
= 10°C,,
.•. dt = 10°C

Amount of heat required (Q) =? (Joule)

Using heat equation,

Q= m*s*dt
= 90 * 0.746 * 10
= 671.4 J

Hence 671.4 Joules of heat is required.