Question #02750

1 Answer
Apr 7, 2016

Answer:

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#