100(23.9/30.3) = 78.9 % Ni, to the justified number of significant digits.
100(6.4/30.3) = 21 % O, to the justified number of significant digits.
Fewer significant digits are given for the oxygen percentage because one of its input data, 6.4, has only two significant digits.
Easy to do on your own.
Ni=79%
O=21%
78.64% Ni
21.36% O
Percentage composition= (mass of the element/mass of the molecule)*100 The fraction of the molecule's mass that comes from the element's mass
HClO3 (gram-formula mass = 84 g/mol)
This is the percent chemical composition.
This depends on the mass of the gold sample.
Mass % of CHCl3 = 15x10-4 %
Mass is an extensive property, which depends only on the amount of matter in the sample, not on the composition of the sample.
Percent composition is usually expressed as a percent by mass, but in the case of gases and vapors, it is often expressed as a percent by volume.
Percentage composition= (mass of the element/mass of the molecule)*100 The fraction of the molecule's mass that comes from the element's mass
77.42% mass of chlorine / mass of entire chemical x 100 = percent composition
Being friends
There are 0.752 g of acetylsalicylic acid. The FW (formula weight) of aspirin is ~180 g/mol. moles = mass/FW.
· Assume that you have 100.0 g sample of the compound · Calculate the amount of each element in the sample · Convert the mass composition of each element to a composition in moles by dividing by the appropriate molar mass
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HClO3 (gram-formula mass = 84 g/mol)
This is the percent chemical composition.
The quantity that serves as a conversion factor between mass and number of moles is the molecular mass.
Mass measures the amount of matter in a sample.