Question

The standard heats of formation of CO(g) and H2O (g) at 25°c are 100.5k J and -241.8kJ per mole respectively. Calculate the heat change of the following reaction at this temperature .
H2O(g)+C(s)------------>H2(g)+CO(g)​

Answer 1

Answer:

Answer:-

Molar mass of CO

2

= 44g

Given mass = 200 mg = 0.2g

Number of moles =

44

0.2

=

220

1

Number of moles=

Avogadro’s number

number of molecules

⇒Number of molecules=Avogadro’s number×number of moles

⇒No. of molecules=6.022×10

23

×

220

1

=2.73×10

21

Molecules in

220

1

moles

As 10

21

molecules are removed,

∴ No. of molecules left = 2.73×10

21

−10

21

=1.73×10

21

∴ No. of moles=

Avogadro’s number

No. of molecules

=

6.23×10

23

1.73×10

21

=2.88×10

−3

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