4 years ago

Which of the following is equal to 4 kilograms?

Chemistry

2 answers:

Mariulka [41]4 years ago

6 0

A. 4,000 g is the answer

1kg = 1000g

bezimeni [28]4 years ago

3 0

4 kg= 4,000 g

The correct answer is a. 4,000 g~

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Answer:

Explanation:

From the 1 g sample you have:

0.546 grams of cobalt chloride

1-0.546=0.454 grams of water

Now:

1) The salt

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$n_{Co}=\frac{0.248 g}{58.9 g/mol}=4.21*10^{-3}mol$

$n_{Cl}=\frac{0.298 g}{35.45g/mol}=8.4*10^{-3}mol$

Dividing:

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So the molecular formula will be:

$CoCl_2$

2) The water

The water's molecular weight is M=18 :

$n_{w}=\frac{0.454g}{18g/mol}=0.025 mol$

Bonding with the Co:

$\frac{n_{w}}{n_{Co}}=\frac{0.025mol}{4.21*10^{-3}mol}=6$

The complete formula of the hydrate:

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