The volume occupied by 4.4 g of CO₂ at S.T.P

(a)

22.4 litre

(b)

2.24 litre

(c)

0.24 litre

(d)

0.1 litre

The volume occupied by 1 mole of a diatomic gas at S.T.P is

(a)

11.2 litre

(b)

5.6 litre

(c)

22.4 litre

(d)

44.8 litre

The gram molecular mass of oxygen molecule is

(a)

16 g

(b)

18 g

(c)

32 g

(d)

17 g

1 mole of any substance contains __________ molecules

(a)

6.023 × 10²³

(b)

6.023 × 10^-23

(c)

3.0115 × 10²³

(d)

12.046 × 10²³

The sum of the numbers of protons and neutrons of an atom is called its __________

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mass number

The average atomic mass of hydrogen is ___________ amu.

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1.008

The number of atoms present in a molecule is called its ____________

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atomicity

One mole of any gas occupies ________ ml at S.T.P

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22400

Atomicity of phosphorous is ___________

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4

Define: Relative atomic mass.

Define: Atomicity

Find the percentage of nitrogen in ammonia.

Calculate the number of water molecule present in one drop of water which weighs 0.18 g.

Give the salient features of “Modern atomic theory”.

Calculation of molecular mass
Calculate the gram molecular mass of the following.
i) H₂O
ii) CO₂
iii) Ca₃ (PO₄)₂