how many molecules are there in 3L of CCl4, at STP

Question

how many molecules are there in 3L of CCl4, at STP

Answer 1

1. the molecule carbon tetrachloride (CCl₄₎ has an atomic weight of 153.8awu, so 1 Mole will have 153.8g

 

2. carbon tetrachloride is a liquid at standard temperature and pressure

 

3. its density is 1.6g/ml

 

4. we are given that there are 3L, so 3,000ml x 1.6g/ml ≅ 4800g

 

5. 4800g ÷ 153.8g/Mole ≅ 31.2 Moles

 

6. 31.2 Moles x Avogadro's number ≅ number of molecules

31.2 Mole x Avogadro's number = 31.2 Moles x 6.023x10²³ ≅

187.7 x 10²³ ≅ 1.88 x 10²⁵