3 years ago

Please help!!!!!!!!!!!

Chemistry

1 answer:

Butoxors [25]3 years ago

6 0

Answer:

I think it is B

Explanation:

Both prokaryotes and eukaryotes have all of those things except for organelles, which only eukaryotes have (also prokaryotes are smaller not eukaryotes)

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The empirical formula of a sample of gold bromide was found by adding aluminum metal to an aqueous solution of gold bromide, dis

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Answer:

a. True

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When calculating the average atomic mass, which of the following are needed for each isotope? Select all that apply.

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3 years ago

What is the empirical formula of an oxide of chromium that is 48% oxygen

AnnyKZ [126]

Answer:

$CrO_3$

Explanation:

Hello,

In this case, considering that the compound is 48% oxygen, we infer it is 52% chromium, therefore, by using their atomic masses we compute the moles by assuming those percentages as masses:

$n_{Cr}=52g*\frac{1mol}{52g}=1mol\\ \\n_O=48g*\frac{1mol}{16g}=3mol$

Next, by dividing by the smallest moles, we find the subscripts in the empirical formula:

$Cr=\frac{1}{1} =1\\\\O=\frac{3}{1} =3$

Which are also expressed in the smallest whole numbers, therefore the empirical formula is:

$CrO_3$

Which corresponds to the chromic oxide or chromium (IV) oxide.

Regards.

6 0

3 years ago