heat in terms of kcals not kJ How much heat is required to raise the temperature...

Question

Question

heat in terms of kcals not kJ
How much heat is required to raise the temperature of 11.1 g of water from -45°C to 175 °C? heat: kcal

Answer 1

Answer #1

Specific heat capacity of water is 4.2 J/g ^oC.

So, for 1 gram water, to rise temperature by 1^oC it needs 4.2 J heat.

Hence, for 11.1 g water, to rise temperature by 1^oC it will need (4.2×11.1)J = 46.62 J heat.

Now, raising 1^oC needs 46.62 J heat ( for 11.1g)

Hence, raising (175-(-45)) ^oC = 220^oC will need (46.62×220) J = 10256.4 J heat = 10.2564 kJ heat.

Now, 1 kJ = 0.239 kcal

Hence, 10.2564 kJ = (0.239×10.2564)= 2.45 kcal.

Hence, the heat required is = 2.45 kcal.

Answer 2

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