# Chapter 4 Stoichiometry: Quantitative Information about Chemical Reactions - Study Questions - Page 179h: 91

$C_{3}H_{2}O$

#### Work Step by Step

Number of moles of $CO_2$: $257\ mg\div 44.01\ mg/mmol=5.84\ mmol$, $5.84\ mmol$ of C, $70.14\ mg$ Number of moles of water: $35.0\ mg\div 18.015\ mg/mmol=1.94\ mmol$, $3.89\ mmol$ of H, $3.92\ mg$ Number of moles of oxygen: $(105-70.14-3.92)\ mg\div 15.9994\ mg/mmol=1.93\ mmol$ O/C Ratio: $0.33=1/3$ H/C Ratio: $0.67= 2/3$ $C_{3}H_{2}O$

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