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## 19 Gold reacts with the elements in Group 7 of the periodic table. 0.175 g of gold reacts with chlorine. The equation for

Question

19

Gold reacts with the elements in Group 7 of the periodic table.

0.175 g of gold reacts with chlorine.

The equation for the reaction is:

2 Au + 3 Cl2 – 2 AuCla

Calculate the mass of chlorine needed to react with 0.175 g of gold.

Give your answer in mg

Relative atomic masses (Ar): Cl = 35.5 Au = 197

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Chemistry
3 years
2021-07-16T01:59:27+00:00
2021-07-16T01:59:27+00:00 1 Answers
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## Answers ( )

Answer:The mass of chlorine gas required is 94.6 mgExplanation:The

number of molesis defined as the ratio of the mass of a substance to its molar mass.The equation used is:……(1)

Given mass of gold = 0.175 g

Molar mass of gold = 197 g/mol

Plugging values in equation 1:The given chemical equation follows:By the stoichiometry of the reaction:If 2 moles of gold reacts with 3 moles of chlorine gas

So, 0.000888 moles of gold will react with = of chlorine gas

Molar mass of chlorine gas = 71 g/mol

Plugging values in equation 1:(Conversion factor: 1 g = 1000 mg)Hence, the mass of chlorine gas required is 94.6 mg