Chemistry
Atoms and Atomic Structure
Atomic Mass

# How is the number of moles determined from a known mass?

Number of moles = Total mass/Molar mass

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## Related Questions

The molar mass is the measurement of mass per one mole of a substance. If the mass of a matter is known, divide it from the molar mass to obtain the number of moles.

the molar mass is used as a conversion factor to convert grams to moles

To calculate the number of moles from a known mass, divide the mass (in grams) by the molar mass (in grams per mole) of that particular compound.

1 mol is equivalent to the molar mass of a compound, in grams.

By dividing the known mass by the atomic mass of the element, for most elements, or by the molecular mass for those elements known to form polyatomic molecules, such as H, N, O, F, Cl, Br, and I. The molar mass is used as a conversion factor to convert grams to moles.

Multiply the number of moles times the molar mass of the compound. Moles cancel and you are left with mass in grams.For example: What is the mass of 2.47 moles of sodium chloride, NaCl?Known: The molar mass of NaCl is 58.44g/mol. (Using atomic weights in grams from the periodic table.)Solution:2.47mol NaCl x 58.44g/mol NaCl = 144g NaCl

By dividing the total mass of the number of moles that you are considering by number of moles; the result is the molar mass.

The mass of 1 mole of the element is used as a conversion factor to convert grams to moles

Conversion of a certain mass of a substance to moles requires knowing the molar mass. Molar mass is given in grams per mole. Dividing the known mass by the molar mass gives the number of moles.

Number of moles is determined by dividing molar mass into the number of grams. SO2 has a molar mass of 64.066 g. To find the number of moles in 250.0 g of SO2, divide 250.0 g by 64.066 g. This gives you just over 3.9 moles.

A mole is a defined number of atoms/molecules of an element/compound. Therefore, the number of moles of NaCHO3 will depend on the mass of NaCHO3 that you have. To calculate the number of moles in a known sample, divide the mass of the sample (in grams) by the molecular weight.

the number of moles is mass in grams divided by relative mass example how many moles are there in 42g of carbon? answer 42 / 12 = 3.5 moles mass in grams divided relative mass = number of moles

the mass number is determined on the number of protons and neutrons in the nucleus of the atom.

The number of moles in the equation of B DIVIDED BY the number of moles in the equation of A ANSWER TIMES the molar mass of B OVER 1. A is the the known compound, B is the one your trying to find out.

number of moles = mass of the substance/molar mass of the substance

number of moles = mass/molecular mass. = 24/12 = ~2 moles

Use the molar mass of an element or compound to convert between the mass of a substance and the moles of a substance. Mass(GRAMS)=number of moles x mass(GRAMS)/1 MOLE

Everything about that element, the mass and number are unique. So the number of protons, electrons, neutrons and position in the periodic table will all be known.

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