Question

Calculate the amount of heat needed to increase the temperature of 250 g of water from 20.0 ºC to 46.7 ºC.

Answer 1

The  amount  of  heat  needed  to increase  the  temperature of 250 g  water from   20 c  to  46.7  c is  calculated  as follows

Q = MC delta T ,  where
Q=  heat = ?
M = mass =250 g
C=  specific heat capacity  of water = 4.186  j/g c
 delat  T = change in temperature =  46.7 -20=26.7 c

Q = 250 g  x4.186 j/g/c  x26.7 c = 27941.55  j  which  is approximate  to  
28000 j(answer A)