Question

Choose the option(s) that show correct molecular masses of mentioned molecules:-

• A. $H_{2}O$ = 18u $C{O}_2$ = 40u
• B. $C{O}_2$ = 44u $H_{2}S{O}_4$ = 98u
• C. $HCl$ = 36.5u $H_{2}S{O}_4$ = 96u
• D. $S{O}_2$ = 64u $HCl$ = 36.5u

Answer 1

Answer: (B), (D)

The correct options are
B

$C{O}_2$ = 44u

$H_{2}S{O}_4$ = 98u

D

$S{O}_2$ = 64u

$HCl$ = 36.5u

The molecular mass of mentioned molecules is equal to the sum of their individual atomic masses.

$HCl$ = 1 + 35.5 = 36.5u (Atomic mass of hydrogen is 1 while that of chlorine is 35.5)

$S{O}_2$ = 32 + 2(16) = 64u (Atomic mass of sulphur is 32 while for oxygen atom is 16)

$H_{2}O$ = 2(1) + 16 = 18u (Atomic mass of hydrogen is 1 while for oxygen is 16)

$H_{2}S{O}_4$ = 2(1) + 32 + 4(16) = 98u (Atomic mass of hydrogen is 1, sulphur is 32 while for oxygen is 16)

$C{O}_2$ = 12 + 2(16) = 44u (Atomic mass of carbon is 12, oxygen is 16)