Question

A 20 g gold coin is heated from 10°C to 50°C ( CAu is 0.13 J/g−°C ). What is the △H ? (Hint: Remember ΔH=q, so if you solve for q, you might have your answer!)

Answer 1

• Mass=m=20g
• ∆T=50-10=40°C
• Specific heat=c=0.13J/g°C

Now

$\\ \rm\rightarrowtail Q=mc\delta T$

$\\ \rm\rightarrowtail Q=20(40)(0.13)$

$\\ \rm\rightarrowtail Q=800(0.13)$

$\\ \rm\rightarrowtail Q=104J$