Question

1.
Calculate the energy required to heat a beaker of water at 18 °C to boiling. The mass of the
water is 70.0 g.

Answer 1

Answer:

24000 J = 24 kJ

Explanation:

Using the formula q = mcΔT (energy required to heat an object)

q = energy required

m = mass (70.0 g)

c = specific heat capacity (4.179 J *°C⁻¹*g⁻¹)

ΔT = change in temperature (100-18 = 82°C)

∴q = 70.0g * 4.179 J *°C⁻¹*g⁻¹ * 82°C ( symbols g, °C⁻¹,g⁻¹ and °C cancel out everything is multiplied together)

∴q = 24000 J = 24kJ