How do u calculate the molar mass of a compound from its formula then use it to convert between moles and gram

Question

HELP

Answer 1

Use the atomic weights of the individual elements, and add them together. For instance, if I had water, H2O:

H - 1.01 g * 2 = 2.02 g
O - 16.00 g

So the molar mass of H2O would be 18.02 g/mol.

If I wanted to convert from grams to moles, I would divide the grams by the molar mass. Grams cancels out to be left with moles.

If I wanted to convert from moles to grams, I would multiply the moles times the molar mass. Moles would then cancel out to be left with grams.

Answer 2

To find the molar mass of a compound add up the atomic masses of the elements in their respective ratios.

Consider NaOH (sodium hydroxide)
Ar (atomic mass) of Na = 23g
O = 16g
H = 1g

Now there is only one atom of each element so:
(1 x 23) + (1 x 16) + (1 x 1)
= 23 + 16 + 1
= 40g

If you want to find the weight of 2 moles of NaOH use the formula:
Given mass = molar mass x no. of moles
= 40g x 2
= 80 g

If you want to find the no of moles in 160 g of NaOH use the formula:
No of moles = Given mass / molar mass
= 160 g / 40g
= 4 moles

Answer 3

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Answer 4

to calculate the molar mass of a compound frist should sum the atomic mass of all atoms in compound for example: H2O
2*1+16=18
then if we have mass of a compound so whit division the mass to the molar mass can calculate the number of moles of that compound.
if we have the number of moles so with multiplication of molar mass in number of moles we can get the mass.

Answer 5

Atomic weights: B=11, Br=80, BBr3=251 3gBBr3 x 1molBBr3/251gBBr3 = 0.01 mole BBr3 to at least one major verify 0.01molBBr3 x 6x10^23moleculesBBr3/1molBBr3 = 6 x 10^21 molecules BBr3 study the aspect label approach (dimensional diagnosis). Then preserve the units, and the numbers will preserve themselves.

Answer 6

you add the total mass of each atom and the ratio you are looking for is:

1 mole: [total atomic weight/mass] grams.

basically the same thing, unless you have like .5 moles of the comound in which case you would flip the ratio (divide them) and multiply by the .5 moles of the compound.

I got over a hundred percent in stoichiometry, which is what you are doing.

Answer 7

its easy u need not worry

ex of water

its formulae isH2O

atomic mass of H&O are 1 & 16 respectively

therefore its molecular mass is 2*1 + 16 = 18 gm/mol

we should add the atomic masses of individual element And multiply them by their superscript

Answer 8

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