How many molecules are contained in two 540.−mg tablets of penicillin (c16h18n2o4s, molar mass 334.4 g/mol)? report your answer with the appropriate number of significant figures.

9.72 × 10^20 molecules

Explanation:

We are given;

The mass of the compound C16H18N2O4S as 540 mg Molar mass of C16H18N2O4S = 334.4 g/mol

We are required to determine the number of molecules in 540 mg of penicillin.

We know that 1 mole of a compound contains molecules equivalent to the Avogadro's number.That is, 1 mole of a compound = 6.022 × 10^23 moleculesTherefore, 1 mole of C16H18N2O4S = 6.022 × 10^23 molecules

But, 1 mole = 334.4 g

Thus, 334.4 g of C16H18N2O4S contains 6.022 × 10^23 molecules

Mass of C16H18N2O4S = 540 mg or 0.54 g

Molecules in 0.54 g will be;

= (0.54 g ÷ 334.4 g) × 6.022 × 10^23 molecules

= 9.72 × 10^20 molecules

The answer to the question is d

Any vitamins or supplements can be obtained without prescription and are widely used as alternative from western medications. most supplements are not valued by the fda or any other drug and food agencies.