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

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




A piece of copper alloy with a mass of 79.0 g is heated from 27.0◦C to 41.0◦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. 


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


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. 


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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