Question

3. Which of the following contain same number of carbon atoms as in 6g of

carbon-12 ______.

a) 7.5g ethane b) 8g methane c) both a and b d) none of these​

Answer 1

Answer:

(b) 8g methane.

Explanation:

The reason behind this is 6g of C12 contains 0.5 mol and 8g CH4 also contains 0.5 mol. Since 1 mol of anything contains 6.022×10^23 atoms therefore 0.5 mol of anything will contain equal no. of atoms i.e. 3.011×10^23 atoms

Answer 2

Answer:

8 g Methane

Explanation:

No. of moles in 6 g of carbon 12 = Given mass/ molar mass

                                                      = 6/12

                                                      = 0.5 moles

No. of atoms = Moles x avogadro number = 0.5 x avogadro number

Now moles in 7.5 g ethane = 7.5/30 = 0.25 moles

No. of atoms = 0.25 x avogadro number

Moles in 8 g methane = 8/16 = 0.5

No. of atoms = 0.5 x avogadro number

Thus 8 g methane contains same number of atoms as in 6 g carbon.

Hope it helps.

MARK IT AS THE BRAINLIEST.