Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 11

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9th CBSE

IMPORTANT

Earn 100

The mass of _____ is equivalent to one atomic mass unit:

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Important Questions on Atoms and Molecules

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9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 12

The gram atomic mass of

{}_{11}^{23}{Na}

is

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Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 13

An atom of copper has a mass of

1.0625 \times 10^{- 22}

g. The number of copper atoms present in

16

g of copper is:

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Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 14

An atom of oxygen weights

2.656 \times 10^{- 23}

g. The number of oxygen atoms present in

2

g of oxygen is:

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Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 15

An atom of magnesium weighs

3.98 \times 10^{- 23}

g. The number of atoms present in

12

g of magnesium is:

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Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 1

State the law of conservation of mass.

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Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 2

State the law of definite proportions.

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Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 1

In a reaction,

10

g of calcium carbonate reacts with

7.3

g of hydrochloric acid. The products of reaction are

11.1

g of calcium chloride,

1.8

g of water and

4.4

g of carbon dioxide gas. Show that these observations are in agreement with the law of conservation of mass.

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Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3A>Q 2

Magnesium and oxygen combine in the ratio of

3 : 2

by mass to form magnesium oxide. How much mass of oxygen is required to react completely with

12

g of magnesium?