Monday
March 30, 2015

Homework Help: Chemistry Help(Calorimetry)

Posted by Bonn on Friday, April 9, 2010 at 1:37am.

I have a few questions to ask, since I was absent from school and I do not really understand the calorimetry problems.

1) When a 16.9 g sample of NaOH dissolves in 70.0 g of water in a calorimeter, the temperature rises from 22.4*C to 86.6*C. Calculate for Delta H for the process NaOH(s) -> Na(aq) + OH(aq)

2) A 2.5 g sample of zinc is heated, then placed in a calorimeter containing 65.0 g of water. Temperature of water increases from 20.00*C to 22.50*C. The specific heat of zinc is 0.390 J/g*C. What was the initial temperature of the zinc metal sample.

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