If one mole of acetone has a mass of 58.1 g, what is the mass of 0.015 millimoles (mmol) of the acetone? express your answer in nanograms using the correct number of significant figures.

1 mole of acetone has a mass of 58.1 g thus, molar mass of acetone is 58.1 g/mol. Number of mole can be converted into mass as follows:

...... (1)

Here, n is number of mole, m is mass and M is molar mass.

First convert milimole to mole as follows:

Thus,

Putting the values in equation (1)

Converting grams into nano grams:

Thus,

Thus, the mass of acetone is nano grams.

yes

explanation:

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answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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