Can somebody please help me with these four problems that goes together in chem!

Posted on 2018-05-08 18:09:00 in Chemistry by ROGER SMITH

1 
A piece of copper alloy with a mass of 79.0 g is heated from 27.0â—¦C to 41.0â—¦C. In the process, 
it absorbs 429 J of energy as heat. What is the specific heat of this copper alloy? 
Answer in units of J/g · K. 

2 
How much energy will the same sample lose if it is cooled from 41.0â—¦ to 23.0â—¦C ? 
Answer in units of J. 

3 
Calculate the number of moles in a liquid sample of a substance that has a molar heat of fusion of 3.811 kJ/mol, if the sample releases 87.0 kJ when it freezes. 
Answer in units of mol. 

4 
Calculate the molar mass of the substance if the mass of the sample is 2541 g. 
Answer in units of g/mol.

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