Question #02750

1 Answer
Richard G.
Apr 7, 2016

76.7g

Explanation:

Q=mC_w(DeltaT_w)

Rearrange formula to solve for m
m=Q/(C_w DeltaT)=Q/(C_w(T_f-T_o))

Substitute data
m=(5455J)/(4.184J/(goC) (42.0C-25.0C))

m= (5455J)/(4.184(17))=76.69272g

Original data has three significant figures, so answer can only have three significant figures,
m=76.7g

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