How many particles are there in 1 mole?

• 6.022 × 10^23

• 3.011 × 10^23

• 1.602 × 10^-19

• 1000

Avogadro’s number is used for?

• Measuring mass

• Measuring volume

• Representing number of particles

• Measuring density

Atomic mass of an element is expressed in which unit?

• Gram

• Kilogram

• Atomic mass unit (amu)

• Mole/Litre

Volume of 1 mole of gas at STP is?

• 22.4 L

• 2.24 L

• 1 L

• 0.224 L

Number of molecules in 0.5 mol of H₂O is?

• 3.011 × 10^23

• 6.022 × 10^23

• 1.505 × 10^23

• 2 × 10^23

Moles of hydrogen in 18 g of H₂O?

• 1 mol

• 2 mol

• 3 mol

• 0.5 mol

Molarity (M) is defined as:

• Mass of solution / Volume of solvent

• Moles of solute / Volume of solution (in L)

• Mass of solute / Volume of solution (in mL)

• Moles of solute / Mass of solvent

Moles of NaCl in 500 mL of 0.1 M solution are:

• 0.05 mol

• 0.1 mol

• 0.5 mol

• 5 mol

Empirical formula represents:

• Total number of atoms in a molecule

• Simplest whole-number ratio of atoms

• Actual number of atoms in a molecule

• Atomic weights of elements

Which statement of Dalton’s atomic theory is incorrect?

• All elements are made up of indivisible particles

• All atoms of a given element have the same mass

• Atoms are neither created nor destroyed in chemical reactions

• Atoms are made of subatomic particles