Ethanol C2H5OH is the substance commonly called "alcohol". The density of liquid ethanol is 0.7893 gml-1 at 20°C. If 1.2 mol of ethanol is needed for a particular experiment, what volume of ethanol should be measured?
Correct answer: C. 70ml
- A. 55ml
- B. 58ml
- C. 70ml
- D. 79ml
Explanation
ρ=0.7893g/ml n=1.2 mole The molar mass of ethanol= 46 Weight of ethanol=? Volume=? n=WeighT/Molarmass =Weight/46 ⇒1.2×46=Weight ⇒55.2g=Weight ρ=Volumeweight =55.2 /0.7893 =Volume Volume=69.9ml≈70ml
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