Question

find the molecular mass of
(a)H2S (b)HCl

Answer 1

H2S= 14×2+32=28+32=60

HCI=14+35.5=49.5

Answer 2

Question:

Find the molecular weight of

a) H₂S

b) HCl

Subject:

Chemistry

Topic:

Finding the molecular weight of the given compound

Solution:

To find the molecular weight of

a) H₂S

$\boxed{ \begin{minipage}{10cm} Atomic Weights:\\\\\\Atomic Weight of Hydrogen= 1\\\\Atomic Weight of Sulphur= 16 \\\\\\Number of Atoms present:\\\\\\Number of Hydrogen atoms present = 2\\\\Number of Sulphur atoms present = 1\\\\\\Molecular Weight of H_2S =\\\\\\H = 2\times1=2\\\\S=1\times32=32\\\\\\ Molecular Weight of H_2S = 2+32= \: 34amu \end{minipage} }$

b) HCl

$\boxed{ \begin{minipage}{10cm} Atomic Weights:\\\\\\Atomic Weight of Hydrogen= 1\\\\Atomic Weight of Chlorine= 16 \\\\\\Number of Atoms present:\\\\\\Number of Hydrogen atoms present = 1\\\\Number of Chlorine atoms present = 1\\\\\\Molecular Weight of HCl =\\\\\\H = 1\times1=1\\\\Cl=1\times35.5=35.5\\\\\\ Molecular Weight of HCl = 1+35.5= \: 36.5amu \end{minipage} }$

Answer:

• Molecular Weight of H₂S = 34 amu

• Molecular Weight of HCl = 36.5 amu

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