Question

How many joules of heat are lost when 150.0 g of steam are cooled from 124. C to 86 C?

Answer 1

 The  amount   of  joules  of heat  that are lost when 150.0 g of steam  are cooled  from 124 °c to 86 °c  is = -11343  joules

 calculation

heat(Q) = mass(m) x specific heat capacity(C) x  change  in temperature     (ΔT)

  where,

Q=? joules

M=150.0 g

C for steam = 1.99 j/g/°c

ΔT= 86°c-124°c = -38°c

Q  is therefore = 150.0 g x  1.99 j/g/°c   x -38°c =-11343 joules