Question

I don't unerstand what I'm supposed to do for these

Heat = mass * c * temp change
175g 0.79J/gC 75 C

Heat = mass * c * temp change
352g 1.65J/gC 25 C

Heat = mass * c * temp change
268g 4.18J/gC 40 C

Heat = mass * c * temp change
74g 0.21J/gC 67 C

These are the answers I'm supposed to match with each one
1.04kJ
10.4kJ
14.5kJ
44.8kJ

Answer 1

Step-by-step explanation:

1000 J= 1 kJ

1. Heat = mass × c × Temperature change

=
`175 g* 0.79 J/g^oC* 75^oC=10,368.75 J=10.36878 kJ\approx 10.4 kJ`

2.Heat = mass × c × Temperature change

=
`352 g* 1.65 J/g^oC* 25^oC=14,520 J=14.520 kJ\approx 14.5 kJ`

3.Heat = mass × c × Temperature change

=
`268 g* 4.18 J/g^oC* 40^oC=44,809.6 J=44.8096 kJ\approx 44.8 kJ`

4.Heat = mass × c × Temperature change

=
`74 g* 0.21 J/g^oC* 67 ^oC=1,041.18 J=1.04118 kJ\approx 1.04 kJ`

Answer 2

you just need to multiply the terms and transform to kj by dividing by 1000
1) 10.4kj
2) 14.5 kj
3) 44.8 kj
4) 1.04 kj

and there you go.