What is the percent composition of ch4?

Q: How do you calculate percent CH4?

Well use methane, CH4, as an example. The formula weight of methane is [12.01 + (4 x 1.008)] = 16.04. In terms of mass, methane is (4.032/16.04) x 100 = 25.13% hydrogen and (12.01/16.04) x 100 = 74.87% carbon. N.B. In this example the numerical values of the atomic masses are given to 4 significant figures.

In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

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What is the composition of CH4?
How do you calculate percent CH4?
What is the percentage composition of carbon by mole in CH4?
What is the percentage composition of CF4?

The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.

Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.

Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.

Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.

A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.

If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.

Hint: The number of moles in a given sample of an element or a compound can be calculated by dividing the total mass of the sample by the molar mass of the element or compound, as described by the following formula.
$\text{Moles=}\dfrac{\text{Weight}}{\text{Molecular}\,\text{Weight}}$

Complete step by step answer:
-In the field of chemistry, a mole is defined as the amount of a substance that contains exactly $6.02214076\text{ }\times \text{ }{{10}^{23}}~$ ‘elementary entities’ of the given substance.
-The number $6.02214076\text{ }\times \text{ }{{10}^{23}}~$ is popularly known as the Avogadro number which is the value of the Avogadro constant and is often denoted by the symbol ‘${{N}_{A}}$ ’. The elementary entities that can be represented in moles can be atoms, molecules, monatomic or polyatomic ions, and other particles (such as electrons).
-Methane is a hydrocarbon having the chemical formula $C{{H}_{4}}$.
-In methane there is one atom of carbon and four atoms of hydrogen. It is a hydride of group-14 and the simplest alkane, and is the main constituent of natural gas.
-One mole of methane has a molecular mass of 16 g/mol.
-In one mole of methane, we have one mole of carbon atoms and 4 moles of hydrogen atom, therefore, the percentage composition of C by mole in methane will be,
The percentage of C atom in methane is = $\dfrac{12}{16}\times 100 %$
Hence, percentage of C = 75 %
Therefore, one mole of methane has 75 % of carbon, The correct option is option “C” .

Note: The atomic mass of a carbon-12 atom is 12 atomic mass units, but that of a carbon-13 atom is 13 amu. The atomic mass of an element given will be roughly equal to the sum of all the protons and neutrons present in the nucleus of an atom.
If the percentage composition of hydrogen by mass was asked then, we will give the value 4 as the numerator in the formulae, since there are four moles of hydrogen present in methane.
- The percentage of H atom in methane is = $\dfrac{4}{16}\times 100%$
Therefore, percentage of H in methane = 25 %

What is the composition of CH4?

-Methane is a hydrocarbon having the chemical formula CH4. -In methane there is one atom of carbon and four atoms of hydrogen. It is a hydride of group-14 and the simplest alkane, and is the main constituent of natural gas. -One mole of methane has a molecular mass of 16 g/mol.

How do you calculate percent CH4?

We'll use methane, CH₄, as an example. The formula weight of methane is [12.01 + (4 x 1.008)] = 16.04. In terms of mass, methane is (4.032/16.04) x 100 = 25.13% hydrogen and (12.01/16.04) x 100 = 74.87% carbon. N.B. In this example the numerical values of the atomic masses are given to 4 significant figures.