Question

How many molecules are in 165 g of carbon dioxide?

6.774 × 1024

2.258 × 1024

2.258 × 1025

6.774 × 1024

Answer 1

м(СО₂)=165 г

н(СО₂)=м(углекислого газа)/М(СО₂)

Н=Nₐ*м(углекислого газа)/М(СО₂)

Н=6.022*1023 * 165/44.01=2.258*10²⁴

Answer 2

you can't convert grams to molecules directly. First, we need to convert the grams to moles, and then to molecules

to convert grams to moles, we use the molar mass of the molecule. to convert moles to molecules, we use Avogadro's number. (1 mol= 6.02 x 10²³ molecules)

molar mass of CO₂= 12.0 + (2 x 16.0)= 44.0 g/mol


`165 g CO_2 = ( (1 mol)/(44.0 g))( (6.02x10^(23))/(1 mol) )= 2.258x10^(24)`