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The percent composition of all elements in HClO3 is: a. 2% H, 20% Cl, 78% O b. 1% H, 42% Cl, 57% O c. 2% H, 68% Cl, 30% O d. None of the above
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Mar 5, 2017
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The percent composition of all elements in HClO3 is:
a. 2% H, 20% Cl, 78% O
b. 1% H, 42% Cl, 57% O
c. 2% H, 68% Cl, 30% O
d. None of the above
Chemistry
high-school
Michael Yuwono
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The answer is
b. 1% H, 42% Cl, 57% O.
Let's first calculate a molar mass (M) of HClO₃.
Molar mass is a mass of 1 mole of a substance. It can be expressed as the sum of relative atomic masses (Ar), which are masses of atoms of the elements:
M(HClO₃) = Ar(H) + Ar(Cl) + 3Ar(O)
Ar(H) = 1 u
Ar(Cl) = 35.5 u
Ar(O) = 16 u
M(HClO₃) = Ar(H) + Ar(Cl) + 3Ar(O) = 1 + 35.5 + 3 ·
16 = 84.5 u
Now, we just need to calculate mass percent of each element using the proportion:
Ar : x = M : 100%
⇒ x = Ar ÷ M · 100%
Hydrogen
: x = Ar(H) ÷ M · 100% = 1 ÷ 84.5 · 100% = 1.2% ≈
1%
Chlorine
: x = Ar(Cl) ÷ M · 100% = 35.5 ÷ 84.5
· 100% =
42%
Oxygen
: x = 3Ar(O) ÷ M · 100% = 48 ÷ 84.5 · 100% = 56.8% ≈
57%
Shehata Gamal
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Mar 11, 2017
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Shehata Gamal
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