When a metal carbonate reacts with a suitable acid, carbon dioxide is produced. You will determine the relative formula mass, $$$M_{r}$$$, of a metal carbonate by reacting it with excess hydrochloric acid and measuring the mass of gas produced. FA 1 is the metal carbonate. FA 2 is $$$2.00 \mathrm{moldm}^{-3}$$$ hydrochloric acid, HCl . State the uncertainty in a single balance reading. $$\[ \text { uncertainty }= \pm . \]$$ .......................... . 9 Give an expression that would enable you to calculate the percentage error in your weighing of FA 1.

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_33 Year：2024 Question No：1(d)

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Knowledge points:

2.2.1 define and use the term mole in terms of the Avogadro constant

2.4.1.1 reacting masses (from formulae and equations) including percentage yield calculations

2.4.1.2 volumes of gases (e.g. in the burning of hydrocarbons)

2.4.1.3 volumes and concentrations of solutions

2.4.1.4 limiting reagent and excess reagent (When performing calculations, candidates’ answers should reflect the number of significant figures given or asked for in the question. When rounding up or down, candidates should ensure that significant figures are neither lost unnecessarily nor used beyond what is justified (see also Mathematical requirements section).) deduce stoichiometric relationships from calculations such as those in 2.4.1 (1)–(4)

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