Question

How many molecules are there in 45.0 grams of CH4?

Answer 1

Answer:
`16.93* 10^(23)\ \text{molecules}`

Step-by-step explanation:

Given

Mass of
`CH_4`
`m=45\ gm`

Molar mass of
`CH_4` is
`12+4*1=16`

No of moles of
`CH_4`
`=\frac{\text{Mass}}{\text{Molar mass}}=(45)/(16)`

No of Molecules in 45gm of
`CH_4` is

`\Rightarrow N_A*(45)/(16)=6.022* 10^(23)* (45)/(16)\\\Rightarrow 16.93*10^(23)\ \text{molecules}`