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Atoms And Molecules

Question
CBSEENSC9006172
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Relative density of silver is 10.8. The density of water is 103 kg m–3. What is the density of silver in S.I. unit?

Solution

Given,

Relative density of silver = 10.8
Density of water = 103 kg/m3

Now, using the formula of relative density, 

Relative density = Density of silver
                            Density of water

So,

Density of silver = R. D. x Density of water

                         = 10.8 c 102 kg m-3

The density of silver is 10.8 x 103 kg m-3 

Some More Questions From Atoms And Molecules Chapter

What are polyatomic ions? Give examples.

Write the chemical formulae of the following:

(a) Magnesium chloride
(b) Calcium oxide
(c) Copper nitrate 
(d) Aluminium chloride
(e) Calcium carbonate

Give the names of the elements in the following compounds.

(a) Quick lime
(b) Hydrogen bromide
(c) Baking powder 
(d) Potassium sulphate.

Calculate the molar mass of the following substances:

(a) Ethylene
(b) Sulphur molecule, S8
(c) Phosphorus molecule, P4
(d) Hydrochloric acid, HCl
(e) Nitric acid, HNO3.

What is the mass of:

(a) 1 mole of nitrogen atoms

(b) 4 moles of aluminium atoms

(c) 10 moles of sodium sulphite.

Convert into mole

(a) 12 gm of oxygen gas

(b) 20 gm of water

(c) 22 gm of carbon dioxide.

What is the mass of?

(a) 0.2 mole oxygen atoms.

(b) 0.5 mole of water molecules.

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

Calculate the number of aluminium ions present in 0.56 gm of aluminium oxide.

Explain law of conservation of mass.

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