[mnuslt]

This is the  question: How many atoms of fluorine are in 19g of CH2F2?

I work this out like this 19/52x6.02x10(23)=2.2x10(23)
 but the ans was 4.4x10(23) What am I doing wrong?

[Garneck]

This is the  question: How many atoms of fluorine are in 19g of CH2F2?

I work this out like this 19/52x6.02x10(23)=2.2x10(23)
 but the ans was 4.4x10(23) What am I doing wrong?

1. Count the molar mass of CH2F2
2. Count the moles of CH2F2 in 19g
3. Multiply that by 2 (2 atoms of F in one molecule)
4. Multiply that by 6,02*10²³