Calculate the molar mass of the following substances

Question

Calculate the molar mass of the following substances.

(a) Ethyne, C₂H₂

(b) Sulphur molecule, S₈

(c) Phosphorus molecule, P4 (Atomic mass of phosphorus =31)

(d) Hydrochloric acid, HCl

(e) Nitric acid, HNO₃

Asked by Vishal kumar | 2 years ago | 366

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Class 9 Science Atoms and Molecules Add Answer

Calculate the number of aluminium ions present in 0.051g of aluminium oxide.

(Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27u)

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Calculate the number of molecules of sulphur (S8) present in 16g of solid sulphur.

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What is the mass of:

(a) 0.2 mole of oxygen atoms?

(b) 0.5 mole of water molecules?

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Convert into mole.

(a) 12g of oxygen gas

(b) 20g of water

(c) 22g of carbon dioxide

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What is the mass of -

(a) 1 mole of nitrogen atoms?

(b) 4 moles of aluminium atoms((Atomic mass of aluminium =27)?

(c) 10 moles of sodium sulphite (Na₂SO₃)?

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Accepted Answer

Listed below is the molar mass of the following substances:

(a) Molar mass of Ethane C₂H₂= 2 x Mass of C+2 x Mass of H = (2x12)+(2x1)=24+2=26g

(b) Molar mass of Sulphur molecule S₈ = 8 x Mass of S = 8 x 32 = 256g

(c) Molar mass of Phosphorus molecule, P4 = 4 x Mass of P = 4 x 31 = 124g

(d) Molar mass of Hydrochloric acid, HCl = Mass of H+ Mass of Cl = 1+35.5 = 36.5g

(e) Molar mass of Nitric acid, HNO3 =Mass of H+ Mass of Nitrogen + 3 x Mass of O = 1 + 14+ 3x16 = 63g

Answered by Shivani Kumari | 2 years ago