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3 years ago

If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is

Chemistry

1 answer:

Naddik [55]3 years ago

8 0

Answer:

Co2S3.

Explanation:

% of sulphur = 44.94 %

Dividing by the atomic masses:

Co = 55.06 / 58.93 = 0.9343

S = 44.94 / 32.078 = 1.4010

Working out the ratio of Co to S:

1:1.5

= 2:3.

So the empirical formula is Co2S3.

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Lady bird [3.3K]

Answer:

$4.86\times10^{-7}\ \text{m}$

Explanation:

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$\lambda^{-1}=R\left(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2}\right)\\\Rightarrow \lambda^{-1}=1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\\\Rightarrow \lambda=\left(1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\right)^{-1}\\\Rightarrow \lambda=4.86\times10^{-7}\ \text{m}$

The wavelength of the light emitted is $4.86\times10^{-7}\ \text{m}$ .

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10 In a bond between an atom of carbon and an atom of fluorine, the fluorine atom has a

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