Write down the formulae of

Question

Write down the formulae of

(i) sodium oxide

(ii) aluminium chloride

(iii) sodium sulphide

(iv) magnesium hydroxide

Asked by Vishal kumar | 2 years ago | 209

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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

The following are the formulae:

(i) sodium oxide - Na₂O

(ii) aluminium chloride - AlCl₃

(iii) sodium sulphide - Na₂S

(iv) magnesium hydroxide - Mg (OH)²

Answered by Shivani Kumari | 2 years ago