Question

What amount of heat is required to raise the temperature of 85.9 g of water by 7°C? The specific heat of water is 4.184 J/gºC.

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Answer 1

• Mass=m=85.9g
• Specific heat capacity=c=4.184J/g°C
• ∆T=7°C

`\\ \rm\Rrightarrow Q=mc\delta T`

`\\ \rm\Rrightarrow Q=85.9(4.184)(7)`

`\\ \rm\Rrightarrow Q=2515.83J`

Answer 2

2516 J.

Step-by-step explanation:

• The amount of heat required to raise the T of water (Q) can be calculated from the relation:

Q = m.c.ΔT.

where, Q is the amount of heat required to raise the T of water,

m is the mass of water (m = 85.9 g),

c is the specific heat of ethanol in the gas phase (c = 4.184 J/g °C),

ΔT is the temperature difference (final T - initial T) (ΔT = 7.0 °C).

∴ Q = m.c.ΔT = (85.9 g)(4.184 J/g °C)(7.0 °C) = 2516 J.