# GENERAL KNOWLEDGE

## GK

### CHEMISTRY

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many formula units (molecules) are in 1 mole of NaCl?
 A 6.02 x 1023 B 58 C 11 D 17
Explanation:

Detailed explanation-1: -O molecules contains 6.022 x 1023 molecules. 1 mole contains 6.022 x 1023 entities (Avogadro’s number) Concept 1. The meaning and usefulness of the mole Page 2 2 • One mole of NaCl contains 6.022 x 1023 NaCl formula units.

Detailed explanation-2: -Explanation: One mole represents 6.022∙1023 separate entities, just like one dozen represents 12 objects. So, if there are 6.022∙1023 H2O molecules, that is the same as one mole of water.

Detailed explanation-3: -The number of formula units in 1mole(58. 5g) 5 g ) of NaCl N a C l is 6.022×1023 6.022 × 10 23 . Thus, the number of formula units of NaCl N a C l in 1.1×10−4g 1.1 × 10 − 4 g is equal to 6.022×102358.5×1.1×10−4g=1.13×1018 6.022 × 10 23 58.5 × 1.1 × 10 − 4 g = 1.13 × 10 18 formula units.

Detailed explanation-4: -Molar Mass of a Compound This means that the molar mass of NaCl is 58.44 g and it will contain 6.022 × 1023 formula units of NaCl, or one mole of NaCl.

Detailed explanation-5: -Answer and Explanation: If one mole of NaCl will have 6.022×1023 6.022 × 10 23 molecules, then 1.5 moles will have: 1.5moles×6.022×1023molecules/mole=9.03×1023 1.5 m o l e s × 6.022 × 10 23 m o l e c u l e s / m o l e = 9.03 × 10 23 molecules.

There is 1 question to complete.