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3 years ago

Calcium carbonate () is 34.5% Ca by mass. In a 418 g sample of , how many grams of calcium are present?

Chemistry

1 answer:

erastovalidia [21]3 years ago

8 0

Answer:

144.2 g of Ca are present in 418 g of sample

Explanation:

34.5 % Ca → In 100 g of salt there are 34.5 g of Ca

Let's make a rule of three:

In 100 g of salt there are 34.5 g of Ca

In 418 g of salt there must be (418 . 34.5) / 100 = 144.2 g

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3 years ago

In the reaction 2H2O (1)+ 2Cl^- (aq)= H2(g)+Cl2 (g)+ 2OH^-(aq), which substance is reduced?

Oksanka [162]

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Explanations:- Reduction is gain of electron. In other words we could say that decrease in oxidation number is reduction.

As per the rules, oxidation number of hydrogen in its compounds is +1(except metal hydrides) and the oxidation number of oxygen in its compounds is -2.

The oxidation number in elemental form is zero.

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3 years ago