Atomic Mass

Q.

What is the molar mass of sodium carbonate, $\left({\mathrm{Na}}_2{\mathrm{CO}}_3\right)$)?

Q.

Calculate the molar mass of H₃PO_4.

Q.

Calculate the molecular mass of CaSO₄.

Q.

What is atomic mass in detail? What is formula to calculate the atomic mass of atom and how it's formula is made explain in detail?

Q.

What is molecular mass and how to find molecular mass?

Q.

Calculate the molecular mass of potassium permanganate, ${\mathrm{KMnO}}_4$.

[Atomic masses of K=39, Mn=55, O=16]

Q.

Define molecular mass.

Q.

What is the mass of 1 atom of Sulphur?

Q. What is meant by Unified Atomic Mass?

Q.

Which postulate of Daltons atomic theory is the result of the law of conservation of mass?

Q. If 1g of sulphur contains x atoms , calculate the number of atoms in one gram of oxygen element.

Q.

Calculate the mass of 0.2 moles of water.

Q.

Why actual atomic mass is greater than mass number?

Q.

of a polymer containing 30% molecules with molecular mass 20, 000, 40% have 30, 000 and the rest have 60, 000 is

1. 36X10⁵

2. 36X10³

3. 18X10³

4. 18X10⁵

Q.

Element with atomic number 16 is ________.

Q. Which contains more molecules, 10g of sulphur dioxide (SO₂) or 10g of oxygen (O₂)? How?

Q. What is the number of molecules in each of 32g $O_2$ and 44 ${\mathrm{CO}}_2?$

Q.

Why is the atomic mass of iodine-$131$ not "$126.904\mathrm{g}/\mathrm{mol}$l"?

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 density
3. molecular composition
4. molecular mass

Q. 1 atomic mass unit (amu) is defined as:

1. $\frac{1}{16}$ the mass of a oxygen-16 atom
2. $\frac{1}{14}$ the mass of a carbon-14 atom
3. $\frac{1}{12}$ the mass of a carbon-12 atom
4. $\frac{1}{12}$ the mass of a carbon-14 atom

Q. why amu changes to u

Q.

If A is the mass number and Z is the atomic number of an element, then the number of neutrons are

1. A+Z

2. Z-A

3. A-Z

4. A/Z

Q.

Which of the following is the standard for atomic mass?

1. ${}_8{}^{16}\mathrm{C}$

2. ${}_6{}^{12}\mathrm{C}$

3. ${}_1{}^1\mathrm{H}$

4. ${}_6{}^{14}\mathrm{C}$

Q. Potassium Salphate & Potassium Chromate are isoshaped Compound. Potassium Chromate contains 26.8% Chromimum. What is the atomic mass of the Chromimum?

Q. So since 1 atomic unit is exactly 1/12 the mass of 1 c-12 atom,
can we say as follows;
atomic mass of sodium is 23 , so can we say that the atomic mass of sodium is 23 times heavier than 1/12 the mass of 1 carbon-12 atom?

Q.

Sulphur dioxide is a gas composed of one sulphur atom and two oxygen atoms.

a) Is sulphur dioxide a molecule of element or molecule of

compound?

b) What is the atomicity of sulphur dioxide?

c) What is the molecular mass of sulphur dioxide?

Q.

What is relative molecular mass and relative atomic mass? [2 MARKS]

Q. How can we find the atomic weight or mass of any element ?

Q.

Define one atomic mass unit.

Q. How many moles of hydrogen atoms are present in 1 mole of H2o