CaCO3 is the formula of the substance (calcium carbonate), which gives the information about the proportions of the different elements which make up the compound. To find the 'mass percentage' however, it is necessary to use the molar mass of each element.
Molar mass of Calcium = 40.08 g/mol
Molar mass of Carbon = 12.01 g/mol
Molar mass of Oxygen = 16.00 g/mol
To find the percentage mass of one of these elements, divide the molar mass of the element by the total molar mass of the compound (add them all up, using oxygen three times), then multiply by 100%.
Molar mass of CaCO3 = 40.08 +12.01 + 3*16.00 = 100.09 g/mol
% Calcium = 40.08/100.09 * 100% = 40.0%
% Carbon = 12.01/100.09 * 100% = 12.0%
% Oxygen = (3*16.00)/10.09 * 100% = 48.0%
You want to find out for each element. Enjoy the answers.
Na the answer is 43.4
C the answer is 11.3
O the answer is 45.3
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
Na2SO4 = 46+32+64 = 142 Na = 46/142 * 100 = 32.39 % S = 32/142 * 100 = 22.54 % O = 64/142 * 100 = 45.08 %
You must calculate the change in velocity during each unit of time.
The number of protons in the nucleus. This gives the element its elemental number. I.E. Carbon has 6 protons and is element 6.
The number of atoms of that element in the molecule
The number of atoms of one element in the compound
The chemical formula of calcium carbonate is CaCO3.
You need to know the atomic # or the masses of each isotope of the element.
To determine the percentage of oxygen in FeCr2O4, you would first calculate the molar mass of the compound (iron(II) chromite) using the atomic masses of each element (Fe = 55.85 g/mol, Cr = 51.996 g/mol, O = 16 g/mol). Then, calculate the molar mass percentages of each element within the compound, and finally, determine the percentage of oxygen by mass in the compound.
the atomic number of each isotope-apex;)
calculate the density of the element because each element has a different density
The percent composition of a compound tells the amount of each element in the compound as a percentage. It is possible to find if the mass of an element and the total mass of the compound is known.
The atomic mass listed on most periodic tables is actually the average atomic mass representing the average atomic masses of the various isotopes of an element depending on their percent natural abundance. Refer to the answers.com question: What is the formula for finding average atomic mass? for a detailed explanation on how to calculate this value. (What_is_the_formula_for_finding_average_atomic_mass)
There is no way to calculate that with the information provided. We need to know the volume of each.
Start with the number of grams of each element in a problem. Convert that with mass of each element to moles. Divide each mole value by the smallest number of mole then round it to the nearest whole number.
That is done to calculate the weighted average.
It tells you how much of a molecule is made up of each element. - APEX