Question

calculate the molecular mass of the water, carbon dioxide, nitric acid...? ​

Answer 1

Atomic mass of H=1U, N=14u, O=16u. Answer: The molar mass of the chemical substance is equal to the sum of the atomic mass of the individual atoms.

please mark me as brain list

Answer 2

Explanation:

$\bold\red{(っ◔◡◔)っ ♥ Answer ♥}$

NITRIC ACID★

The molar mass of the chemical substance is equal to the sum of the atomic mass of the individual atoms.

Given

Atomic mass of H = 1u

Atomic mass of N = 14 u

Atomic mass of O = 16u

The molar mass of HNO3 is

(1 × 1) +(1 × 14) + (16×3) = 63 u.

WATER★

The total sum of the masses of the atoms or elements present in the molecule is termed as molecular mass.

Calculation of Molar mass of a compound

We can find the molecular mass of the molecule by following the given substance:

Identify the formula of the compound or molecule

Using the formula determine the number of atoms present in each element of the compound or molecule

Multiply the atomic weight of each element with the number of atoms of that particular element

Similarly, do it for all the elements in the molecule or compound

Add up all the values obtained in the above step

Then add the unit as grams/mole you will get the molecular mass of the substance

Molar mass of water

One mole of H2O is made up of 2 moles of hydrogen atoms and 1 mole of oxygen atom.

Molar mass of atoms

Mass of 1 mole of Hydrogen atoms= 1 g /mol

Mass of 1mole of Oxygen atoms = 16 g/mol

Mass of two moles of Hydrogen atoms = 2x 1 g/mol = 2 g/mol.

Mass of one mole of Oxygen atoms = 1 x 16 g /mol

On adding all the above-obtained values we get,

Mass of one mole of water = 2 g/mol + 16 g/mol = 18 g/mol.

Answer

Molar mass of water = 18g/mol

CARBON DIOXIDE ★

We need to find the molecular mass of carbon dioxide

Molecular mass ofCO2= Molecular mass of carbon + 2 (Molecular mass of oxygen) { 2 atoms of oxygen are present)

Molecular mass of carbon = 12

Molecular mass of oxygen= 16

molecular mass of CO2 = 12 + (16 X 2)

= 12 + 32

= 44 g

Mass of 1 mole (6.023 X 1023 molecules) of CO2 is about 44g.