What is the relative formula mass of C2H5CO2H

74

Explanation:

The compound is properly written as: C₂H₅CO₂H

To find the relative formula mass, we must know the atomic mass of the the atoms making up the compound first. The atomic mass is given by the periodic table:

C = 12g

H = 1g

O = 16g

Now use the number of each atom present in the compound to multiply the atomic mass and add up:

C₂H₅CO₂H = (2x12) + (5x1) + (1x12) + (2x16) + (1x1) = 24+5+12+32+1 = 74

It has no unit

The relative formula mass of C₂H₅CO₂H is 74 g/mol.

Explanation:

The relative atomic mass is a dimensionless number that expresses the relationship between the mass of a given element and the unit of atomic mass. It is calculated knowing the mass and also the relative abundance of each isotope. Also, the relative atomic mass is defined from 12th of the mass of the carbon atom. These values for each element can be found in the Periodic Table.

In the case of the relative mass in a compound, the calculation is made by adding the relative atomic masses of the atoms of the formula of said substance, taking into account its abundance in the compound.

In this case, in the Periodic Table of the Elements you obtain the following relative atomic masses:

C: 12 g/mol

H: 1 g/mol

O: 16 g/mol

Then, the relative mass of the compound C₂H₅CO₂H is:

C₂H₅CO₂H = 2*12 g/mol + 5*1 g/mol + 12 g/mol + 2*16 g/mol + 1 g/mol = 74 g/mol

The relative formula mass of C₂H₅CO₂H is 74 g/mol.