Which of the following has the largest number of molecules? a 1 g of benzene, C6H6 b 1 g of formaldehyde, CH2O c 1 g of TNT, C7H5N3O6 d 1 g of naphthalene, C10H8 e 1 g of glucose, C6H12O6

Answer: 1g of formaldehyde

Explanation:

Molar Mass of benzene (C6H6) = (12x6) + (6x1) = 78g/mol

1mole (78g) of benzene contains 6.02x10^23 molecules.

1g of benzene with contain = (6.02x10^23) / 78 = 7.72x10^21 molecules

Molar Mass of formaldehyde (CH2O) = 12 + 2+16 = 30g/mol

1mole (30g) of formaldehyde contains 6.02x10^23 molecules.

1g of formaldehyde will contain = (6.02x10^23) / 30 = 2.01x10^22 molecules

Molar Mass of TNT (C7H5N3O6) = (12x7) + (5x1) + (14x3) + (16x6) = 227g/mol

1mole (227g) of TNT contains 6.02x10^23 molecules.

1g of TNT will contain = (6.02x10^23) / 227 = 2.65x10^21 molecules

Molar Mass of naphthalene (C10H8) = (12x10) + 8 = 128g/mol

1mole (128g) of naphthalene contains 6.02x10^23 molecules.

1g of naphthalene will contain = (6.02x10^23) / 128 = 4.7x10^21 molecules

Molar Mass of glucose (C6H12O6) = (12x6) + 12 + (16x6) = 180g/mol

1mole (180g) of glucose contains 6.02x10^23 molecules.

1g of glucose will contain = (6.02x10^23) / 180 = 3.34x10^21 molecules

Therefore, 1g of each of the compound contains the following:

Benzene = 7.72x10^21 molecules

Formaldehyde = 2.01x10^22 molecules

TNT = 2.65x10^21 molecules

Naphthalene = 4.7x10^21 molecules

Glucose = 3.34x10^21 molecules

From the above, we see clearly that formaldehyde has the largest number of molecules