Question

3. What is the mass in grams of 6.022 x 1023 molecules of CO2? A. 22 g B. 44 g C. 668 D. 28 g

Answer 1

We have

molecules of CO₂ = 6.022 $\times$ 10²³ molecules

We know that

1 mole of substance contains Avogadros number of molecules

Avogadros number = 6.022 $\times$ 10²³

that is

1 mole = 6.022 $\times$ 10²³ molecules

then Moles of CO₂ = given number of molecules / Avogadros number

= 6.022 $\times$ 10²³ molecules /6.022 $\times$ 10²³ = 1 mole

Now we have 1 mole of CO₂

lets calculate its mass by calculating its atoms atomic masses

then mass of CO₂ = 1 $\times$ 12 g/mol + 2 $\times$ 16 g/mol

= 44 g

So answer is 44 g ....Option B is correct