Molar mass of bismuth subsalicylate (C₇H₅BiO₄)

The molar mass of bismuth subsalicylate (C₇H₅BiO₄) is 362.0934 g/mol, summed from the IUPAC standard atomic weights of C x 7, H x 5, Bi, O x 4.

Mass of sample

Amount of substance

mol

Molar mass

362.0934g/mol

= Exact Molar mass of bismuth subsalicylate

Moles in the sample mass: 0.027 617 184 mol
Mass of that amount of substance: 362.0934
Molecules in the sample mass: 1.66315e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*7 + 1.008*5 + 208.98040 + 15.999*4 = 362.093
Moles in the sample mass = 10 / 362.093 = 0.027 617 2
Mass of that amount of substance = 1 * 362.093 = 362.093
Molecules in the sample mass = 0.027 617 2 * NA = 1.66315e+22

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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The formula

Molar mass = sum over elements of (atomic weight x number of atoms)
For C₇H₅BiO₄: 12.011 x 7 + 1.008 x 5 + 208.98040 + 15.999 x 4 = 362.0934 g/mol
Moles = mass / molar mass; mass = moles x molar mass
Molecules = moles x 6.02214076 x 10^23 (the Avogadro constant, exact by definition)

Molar mass in grams per mole is numerically equal to the molecular mass in daltons, so this figure doubles as the molecular weight.

Atomic weights are the IUPAC 2021 standard values. Several elements have a range rather than a single value because isotope ratios vary between sources; the conventional single value is used here.

Composition by mass

Element	Atoms	Atomic weight	Contribution (g/mol)	Share of mass
Bismuth (Bi)	1	208.98040	208.9804	57.715 %
Carbon (C)	7	12.011	84.077	23.22 %
Oxygen (O)	4	15.999	63.996	17.674 %
Hydrogen (H)	5	1.008	5.04	1.3919 %

Contributions add to the molar mass of 362.0934 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of bismuth subsalicylate?

362.0934 g/mol, for the formula C₇H₅BiO₄.

How do you convert grams of bismuth subsalicylate to moles?

Divide the mass in grams by 362.0934 g/mol. One gram of bismuth subsalicylate is 0.00276172 mol.

How many grams are in one mole of bismuth subsalicylate?

362.0934 g, by definition of the molar mass.

Is molar mass the same as molecular weight?

Numerically yes, for the purposes of this calculation. Molecular weight is a dimensionless ratio and molar mass carries units of g/mol, but the digits are identical.

Where the numbers come from

IUPAC 2021 standard atomic weights; Avogadro constant fixed by the 2019 SI.