Question

19. Read the following and answer any four questions from 19(i) to 19 (v)

Species property H2O CO2 Na atom MgCl2

Number of moles 2 B D 0.5

Number of particles A 3.011 × 1023 E F

Mass 36 g C 115 g G

Shashi saw this table in her textbook and drawn all answers but she didn’t know the exact formulae for each

calculations. So, she is confused that she is right or not. Let her know by choose the correct option.

i) What is the correct value of Avogadro’s number?

(a) 6.022× 1023 (b) 6.022× 10 –24 (c) 6.022× 10 – 23 (d) 6.022 × 1026

ii) Value of D is

(a) 5 mole (b) 0.5 mole (c) 1.0 mole (d) 0.1 mole

iii) Value of C is

(a) 44 g (b) 22 g (c) 4.4 g (d) 2.2 g

iv) The number of particles of H2O (A) are

(a) 1.2044× 1024 (b) 1.2044× 10 26 (c) 12.044 × 10 30 (d) 12.044 × 1036

v) The number of particles of MgCl2 (F) are

(a) 3011 × 1023 (b) 30.11 × 1023 (c) 3.011 × 10 23 (d) 301.1 × 1023​

Answer 1

Answer:

Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction (if any).