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Calculations involving masses

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Question 84

A student heats a 3.57 g sample of hydrated cobalt(II) chloride, $CoCl2⋅xH2O\text{CoCl}_2 \cdot x\text{H}_2\text{O}$ , to remove all water of crystallisation. After heating to constant mass, the remaining anhydrous residue has a mass of 1.95 g.

What is the value of $x\,$ in the formula of the hydrated salt?

(Use $A_r\,$ values: $Co=58.9\text{Co} = 58.9$ , $Cl=35.5\text{Cl} = 35.5$ , $H=1.0\text{H} = 1.0$ , $O=16.0\text{O} = 16.0$ )

$2$

$4$

$6$

$7$

Markscheme

Calculations involving masses Questions

GCSE
Chemistry
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.

Calculations involving masses

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Calculations involving masses

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Question 84

What is the value of $x\,$ in the formula of the hydrated salt?

(Use $A_r\,$ values: $Co=58.9\text{Co} = 58.9$ , $Cl=35.5\text{Cl} = 35.5$ , $H=1.0\text{H} = 1.0$ , $O=16.0\text{O} = 16.0$ )

$2$

$4$

$6$

$7$

Markscheme

Calculations involving masses Questions

GCSE
Chemistry
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.