Atomic Mass

Q.

A balloon is filled with 15.5 g of water. What will be the number of water molecules contained in the balloon?

1. $4.18\times {10}^{23}$
2. $2.54\times {10}^{23}$
3. $5.18\times {10}^{23}$
4. $3.28\times {10}^{23}$

Q.

The atomic mass of Oxygen is 16 u.

Considering the above statement, which among the following options can be inferred?

1. The mass is with respect to Carbon -12 atom.

2. The atomic mass of Oxygen is 16 of the mass of carbon 12 atom.

3. The mass is with respect to Carbon -12 atom and the atomic mass of Oxygen is 16 of the mass of carbon 12 atom.

4. The atomic mass of hydrogen is 16 times the mass of Hydrogen.

Q.

Find the mass of oxygen contained in 1 kg of Potassium nitrate (KNO₃)

1. 475.5 g
2. 485.5 g
3. 475.2 g
4. 485.2 g

Q. If the mass of a single atom of an element is $5.31\times {10}^{-23}$ g, then which amongst the following elements could it be?

1. Oxygen
2. Potassium
3. Sulphur
4. Nitrogen

Q. One atomic mass unit is exactly equal to __________ of the mass of one atom of carbon-12.

1. 1/14
2. 1/12
3. 1/10
4. 1/8

Q. 1 u or 1 amu means

1. Mass of C-12 atom

2. $\frac{1}{12}$th mass of an atom of C-12 atom

3. Mass of O-16 atom

4. Mass of Hydrogen molecule

Q. The sum of the atomic masses of all the atoms in a molecule of the substance is known as:

1. molecular structure
2. molecular composition
3. molecular density
4. molecular mass

Q.

What does the abbreviation amu stand for?

1. Atomic molecular unit

2. Atomic mass unit

3. Atomic mole unit

4. Atomic measuring unit

Q.

One atomic mass unit is _______ of the mass of one atom of _________ isotope.

1. , Carbon-14

2. , Hydrogen

3. , Carbon-12

4. , Sulphur

Q.

The mass of Sodium in 11.7 g of Sodium chloride is

1. 6.9 g
2. 7.1 g
3. 2.3 g
4. 5.02 g