Question

Which of the following has the highest mass ?
(1) 1 g atom of C
(2) 1/2 mole of CH4. (3) 10 mL of water
(4) 3.011 x 1023 atoms of oxygen​

please ans my que

Answer 1

Explanation:

Which of the following has the highest mass ?

(1) 1 g atom of C

(2) 1/2 mole of CH4

(3) 10 mL of water

(4) 3.011 x 10²³ atoms of oxygen

Option 1 :-

Mass = 1 g

Option 2 :-

Molar mass of CH4 -

» 12 + 1×4

• » 16 g/mol

As we know that :-

• mass = mole(n) × GMM (Gram molecular mass)

» mass = 1/2×16

• » 8 g

Option 3 :-

As we know that :-

• volume = n × 22400 (mL)

» 10 = n × 22400

• » n = 1/2240 mole

Molar mass of H2O -

» 1×2 + 16

• » 18 g/mol

mass = n × GMM

» 1/2240 × 18

• » 18/2240 g

Option 4 :-

As we know that :-

• Number of molecules = n × 6.022 × 10²³

» 3.011 × 10²³ = n × 6.022 × 10²³

• » n = 1/2 mole

Molar mass of O2 =

» 16×2

• » 32 g/mol

mass = n × GAM(Gram atomic mass)

» 1/2 × 32

• » 16 g

Hence,

3.011 × 10²³ atoms of oxygen has the highest mass.