Question detail

Case 08 ratio-step. A balanced equation is used in a calculation. Which interpretation is safest? Focus on mole ratios calculated masses balance symbol equation in Using moles to balance equations (HT only), not on a neighbouring Unit 4.3 idea.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Use of amount of substance in relation to masses of pure substances

Question

A. Case 08 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for mole ratios calculated masses balance symbol equation
B. Case 08 ratio-step: Treat subscripts inside a formula as reacting mole ratios (Using moles to balance equations (HT only))
C. Case 08 ratio-step: Assume every reactant and product always has a 1 to 1 ratio (mole ratios calculated masses balance symbol equation)
D. Case 08 ratio-step: Use the largest mass as the limiting amount without mole comparison (Use of amount of substance in relation to masses of pure substances)

Answer

The correct option is Case 08 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for mole ratios calculated masses balance symbol equation.

Explanation

The correct option is Case 08 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for mole ratios calculated masses balance symbol equation. It supports the approved learning objective by keeping the method tied to mole ratios calculated masses balance symbol equation in Using moles to balance equations (HT only). The other options are incorrect because they either use the wrong quantitative relationship, lose the required unit, confuse coefficients with subscripts, or report an answer without a complete worked method.

Common mistake

Confusing Mass Ratios with Mole Ratios

Students often confuse mass ratios with mole ratios when balancing equations, leading to incorrect calculations.

Always ensure you are using the mole ratios derived from the coefficients of the balanced equation, not the masses of the reactants or products.

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For Using moles to balance equations (HT only), which option best supports this Unit 4.3 objective: (HT only) Use mole ratios calculated from masses to balance a symbol equation?