Question

Which is the largest number of atom ? a) 8g of methane b) 15 g of hydrogen fluoride c) 15.6g of benzene d) 21.8 g of bromomethane ​

Answer 1

Hey mate here is ur answer

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15g of Hydrogen fluoride has largest number of atoms

Explanation:

For methane (CH4)

molar mass = 12 + 1 × 4 = 16g

given mass = 8g

No. of atoms = Given mass ÷ molar mass × Avogadro's number

= 8 ÷ 16 × 6.022×10^23

=3.011×10^23 atoms

For Hydrogen fluoride (HF)

molar mass = 1 + 19 = 20g

given mass = 15 g

No. of atoms = Given mass ÷ molar mass × Avogadro's number

= 15 ÷ 20 × 6.022×10^23

= 4.5165×10^23atoms

For benzene (C6H6)

molar mass = 12 × 6 + 1 × 6 = 78g

given mass = 15.6g

No. of atoms = Given mass ÷ molar mass × Avogadro's number

= 15.6 ÷ 78 × 6.022 ×10^23

= 1.2044×10^23atoms

For bromomethane (CH3Br)

molar mass = 12 + 1 × 3 + 80 = 95g

given mass = 21.8g

No. of atoms = Given mass ÷ molar mass × Avogadro's number

= 21.8 ÷ 95 × 6.022×10^23

= 1.3818×10^23atoms

Therefore we can see that Hydrogen fluoride has largest number of atoms...

Hope this helps

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