Question detail
Ethanol (C2H5OH) has a relative formula mass of 46.08 g/mol. How many moles are present in 92.16 g of ethanol? Show your working.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Reactions of alkenes and alcohols (chemistry only)
Question
Ethanol (C2H5OH) has a relative formula mass of 46.08 g/mol. How many moles are present in 92.16 g of ethanol? Show your working.
Answer
2 moles
Explanation
This question assesses the ability to calculate the number of moles from a given mass using the relative formula mass. The student must apply the formula for moles from mass correctly. This response is aligned to Alcohols because it explains represent alcohols in displayed, structural and molecular formula forms using the correct AQA GCSE Chemistry organic context. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.
Common mistake
Misunderstanding Alcohol Representation
Students often confuse the displayed formula of alcohols with their structural formula, leading to incorrect representations.
Review the definitions and examples of displayed and structural formulas to ensure clear differentiation between the two.
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