Average Atomic Mass

Q.

Calculate the percentage of nitrogen in ammonium nitrate. $\left(\mathrm{H}=1,\mathrm{N}=14,\mathrm{O}=16\right)$

Q.

Isotopes have the same atomic number but different atomic mass numbers. State whether the given statement is True or False?

1. True
2. False

Q.

Calculate the number of moles in:

5 g of CaCO₃

Q. The atomic mass of carbon is 12 g and that of oxygen is 16 g. grams of carbon contains as many atoms as 50 g of oxygen.

1. 15.9 g
2. 37.5 g
3. 50.0 g

Q. The atomic mass of carbon is 12 g and that of oxygen is 16 g. How many grams of carbon contains as many atoms as 50 g of oxygen?

1. 50.0 g
2. 37.5 g
3. 12.1 g
4. 15.9 g

Q.

A sample contains 22 g of carbon dioxide. This is equal to:

1. One mole of carbon dioxide.

2. Half mole of carbon dioxide.

3. Two moles of carbon dioxide.

4. One molar volume of carbon dioxide.

Q.

The mass of a piece of wood before and after burning was checked and found to be very different. Do you think it follows the law of conservation of mass? How?

Q. Why total mass does not change during a chemical reaction?

Q.

Mass of 7 litres of CO₂ at STP is:

1. 13.75

2. 15.75

3. 12.75

4. 10.75

Q.

According to_________________, the total mass remains conserved in any chemical reaction.

Q. The atomic mass of carbon is 12 g and that of oxygen is 16 g. How many grams of carbon contains as many atoms as 50 g of oxygen?

1. 50.0 g
2. 37.5 g
3. 12.1 g
4. 15.9 g

Q.

The gram atomic mass of helium is:

1. 2 g

2. 3 g

3. 6 g

4. 4 g

Q.

Which of the following statements is/are correct for 80 g of oxygen?

1. Statement (i) is correct.

2. Statement (ii) is correct.

3. Statement (iii) is correct.

4. Statement (iv) is correct.

Q. Why total mass does not change during a chemical reaction?

Q.

Isotopes of the same element have

1. different atomic number

2. same mass number

3. same atomic mass

4. different mass number

Q. The atomic mass of carbon is 12 g and that of oxygen is 16 g. How many grams of carbon contains as many atoms as 100 g of oxygen?

Q. Match the element in Column I with its corresponding property (ies) in Column II.