Question

a) If the specific heat of methanol is 2.51 J/K-g, how many joules are necessary to raise the temperature of 87 g of methanol from 4 oC  to 99 oC ?

b When a 3.78 g  sample of solid sodium hydroxide was dissolved in a calorimeter in 150.0 g  of water, the temperature rose from 14.5 oC  to 45.2 oC . Calculate ΔH (in kJ/mol NaOH) for the following solution process:

NaOH(s)→Na+(aq)+OH−(aq)

Assume that it’s a perfect calorimeter and that the specific heat of the solution is the same as that of pure water.

answer _____  kJ/mol

c)Imagine that you performed this experiment as described in your manual. In doing so, your first pressure reading was 601 mmHg , and your second presure reading was 759 mmHg . Your first volume was 37.6 mL .

What would be your calculated second volume?

d) Imagine that you performed this experiment as described in your manual. In doing so, your first pressure reading was 648 mmHg , and your second presure reading was 766 mmHg . Your first volume was 47.4 mL .

What would the percent error be if your measured second volume was 38.4 mL ?

Answer 1