Question

what mass of co2 contatins as many molecules as yhere are in 9g of h2o

Answer 1

Your answer:

9g of H₂O has: $\frac{9}{18}$ = 0.5 moles

one mole of CO₂ weighs: 12 + 32= 44g

So, there must be 0.5 moles of CO₂ to have the same number of molecules in H₂O, so, there must be: 44 × 0.5 = 22g is present

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Answer 2

Molar mass of carbon dioxide =12+2×16=44 g

Molar mass of O

2

=2×16=32 g

Number of molecules in 32 g oxygen = N

A

Number of molecules in 40 g oxygen =

32

40

×N

A

Given: molecules in 40 g oxygen = molecules of m g carbon dioxide

44

m

×N

A

=

32

40

×N

A

44

m

=

32

40

m=55 g

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