# GENERAL KNOWLEDGE

## GK

### CHEMISTRY

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
 A 53 B 63.55g C 126.9 D 6.02 x 1023
Explanation:

Detailed explanation-1: -One mole of lead (Pb) contains 6.02 × 1023 atoms and its mass is 207.2 g.

Detailed explanation-2: -One mole of any substance contains 6.02 X 1023 units of that substance. Equally important is the fact that one mole of a substance has a mass in grams numerically equal to the formula weight of that substance.

Detailed explanation-3: -The value of the mole is equal to the number of atoms in exactly 12 grams of pure carbon-12. 12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms • The number of particles in 1 mole is called Avogadro’s Number (6.0221421 x 1023).

Detailed explanation-4: -A mole, abbreviated as mol, is a measurement of amount used by scientists. One mole is equal to 6.022x1023 units.

Detailed explanation-5: -Solution: Mole: the amount of a substance that contains 6.02×1023 respective particles of that substance. The molar mass of lithium is 6.941 g/mol. Answer: 0.34 mol is the number of moles of lithium.

There is 1 question to complete.