Question

There are $6.02 \times 10 ^ { 22 }$ molecules each of $N _ { 2 } , O _ { 2 }$ and which are mixed together at 760 mm and 273 K. The mass of the mixture in grams is.

• A. 6.2
• B. 4.12
• C. 3.09
• D. 7

Answer 1

Answer: (A)

6.2

Answer 2

$6.02 \times 10 ^ { 22 }$ molecules of each $N _ { 2 } , O _ { 2 }$ and $H _ { 2 }$

$= \frac { 6.02 \times 10 ^ { 22 } } { 6.02 \times 10 ^ { 23 } }$ moles of each

Weight of mixture = weight of 0.1 mole $N _ { 2 } +$ weight of 0.1 mole $H _ { 2 }$ + weight of 0.1 mole of

$= ( 28 \times 0.1 ) + ( 2 \times 0.1 ) + ( 32 \times 0.1 )$ $= 6.2 \mathrm { gm }$