Question

the standard enthalpy of combustion of formaldehyde ∆cH°=-571kJ how much heat will be evolved in the formation of 22g of CO2​

Answer 1

Answer:

HCHO+O

2

→CO

2

+H

2

O

1 mole formaldehyde→1 mole CO

2

i.e. 44gCO

2

For 44gCO

2

,Δ

c

H=−571.KJ

For 22gCO

2

,ΔH=

44

−571×22

ΔH=−285.5KJ