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Calculations involving masses

Calculations involving masses

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Question 74

Four different anhydrous ionic salts are dissolved separately in 250 cm3 of distilled water. In each case, exactly 10.0 g of the salt is dissolved, and the salt is assumed to dissociate completely into its constituent ions.

Which solution contains the greatest total number of dissolved ions?

(Assume the following relative atomic masses, ArA_rAr​: Li=6.9\text{Li} = 6.9Li=6.9, C=12.0\text{C} = 12.0C=12.0, O=16.0\text{O} = 16.0O=16.0, Al=27.0\text{Al} = 27.0Al=27.0, S=32.1\text{S} = 32.1S=32.1, Cl=35.5\text{Cl} = 35.5Cl=35.5, K=39.1\text{K} = 39.1K=39.1, Ca=40.1\text{Ca} = 40.1Ca=40.1)

A

Lithium chloride, LiCl\text{LiCl}LiCl

B

Calcium chloride, CaCl2\text{CaCl}_2CaCl2​

C

Aluminium sulfate, Al2(SO4)3\text{Al}_2(\text{SO}_4)_3Al2​(SO4​)3​

D

Potassium carbonate, K2CO3\text{K}_2\text{CO}_3K2​CO3​

Markscheme

Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /Calculations involving masses

258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.

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