Question detail

In Relative formula mass, which option best answers variant 1 of this quantitative chemistry objective: Calculate the relative formula mass of a compound from its chemical formula and relative atomic masses?

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

Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

Question

A. formula and unit: Calculate the relative formula mass of a compound from its chemical formula and relative atomic masses
B. wrong formula: uses a different Unit 4.3 relationship from Relative formula mass
C. wrong unit: gives a value without checking the required unit
D. wrong reasoning: confuses coefficients, subscripts, mass, moles, or concentration

Answer

The correct option is formula and unit: Calculate the relative formula mass of a compound from its chemical formula and relative atomic masses.

Explanation

The correct option is formula and unit: Calculate the relative formula mass of a compound from its chemical formula and relative atomic masses. It is correct because it directly supports the approved learning objective to calculate the relative formula mass of a compound from its chemical formula and relative atomic masses. This belongs to Relative formula mass within Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, so the answer must use the named Unit 4.3 relationship and avoid mixing it with nearby ideas such as mass, moles, concentration, yield, atom economy, gas volume, coefficients, or subscripts.

Common mistake

Misunderstanding Relative Formula Mass Calculation

Students often forget to multiply the relative atomic mass by the number of atoms indicated by the subscripts in the chemical formula.

Always ensure to multiply the relative atomic mass of each element by its subscript in the formula before summing them to find the relative formula mass.

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