How much heat is needed to raise the temperature of 7g of water by 16oC?

To find the heat/energy required to raise he temperature of a substance, use this formula:

Q=mcΔT

Q = heat (J)

m = mass of substance (g)

c = specific heat of substance (J/g°C; depends on the substance; you're usually given this or you'll have to look it up)

ΔT = change in temperature (°C)

for this question:

m = 7g; c (water) = 4.186 J/g°C; ΔT = 16 °C

∴ Q = 7g x 4.186 J/g°C x 16 °C = 468.832 J