[alexanda.voo]

Could you please check my answers below and rounding.


A) When 5.000 g of NaHCO3 is added to 600.0 g of water in a ‘coffee cup calorimeter’, the temperature decreases from 22.30°C to 18.87°C. Calculate qcalorimeter, in joules, assuming the specific heat capacity of the solution is the same as pure water: 4.186 Jg-1K-1. Report your value to 4 significant figures, and do not include units in your answer.

I got -8615J is this correct?

B) Calculate ΔH, in kJ mol-1, if all the NaHCO3 dissolves in the water. Report your value to 4 significant figures, and do not include units in your answer.

I got -143.6 KJ is this also correct?

[Orcio_87]

I got -8615J is this correct?

Incorrect, as in calorimeter there are 605 instead of 600 g of solution.

if all the NaHCO3 dissolves in the water

Why 5 g of NaHCO₃ would not dissolve in 600 g of water ?

I got -143.6 KJ is this also correct?

Incorrect, same as above.