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Answer 1

Question:-

1. cholesterol which has a molar mass of 386 g/mol, is composed of 52% C, 13% H and 35% O by mass. Find its molecular formula.

Given:-

• C = 52%.
• H = 13%.
• O = 35%.

To Find:-

• Molecular Formula.

Solution:-

$\sf \large C = 52 \% = \frac{52}{12} = 4.33 \: moles.$

$\sf \large H = 13 \% = \frac{13}{1} = 13 \: moles.$

$\sf \large O = 35 \% = \frac{35}{16} = 2.1875 \: moles.$

$\sf \large C:H:O = 4.33:13:2.1875.$

$\sf \large ≈2:6:1.$

$\sf \large\therefore Empiried \: Formula = (C_2 H_6 O).$

$\sf \large Empirical \: mass =[(12×2)+(6×1)+16].$

$\sf \large = (24 + 6 + 16).$

$\sf \large = 46.$

$\sf \large\therefore m = {{ \cancel\frac{386}{46} }}≈</p><p>8.$

Answer:-

$\sf \large \therefore Molecular \: Formula: \sf \large{\boxed{ \sf \color{yellow} {{C_{16} H_{48} 0_8.}}}}$

Hope you have satisfied.