# Relative Atomic Mass Of Oxygen

In this lesson, we will learn

- The relative atomic mass of oxygen atom is 16.
- The Relative Atomic Weight of Oxygen in Water and in Air A Discussion of the Atmospheric Distribution of the Oxygen Isotopes and of the Chemical Standard of Atomic Weights. The Journal of Chemical Physics 1936, 4 (4), 268-275.

The relative atomic mass of oxygen atom is 16.

- how to calculate the relative formula mass or relative molecular mass
- how to use the relative molecular mass to calculate the percent mass of an element in a compound
- how to use the relative molecular mass to calculate the percent mass of water in a compound

The following diagram shows how to calculate the relative molecular mass or relative formula mass. Scroll down the page for more examples and solutions.

**What is relative formula mass and relative molecular mass?**

The **relative formula mass** of a substance is the sum of the relative atomic masses of the elements present in a formula unit. The symbol for relative formula mass is M_{r}.

If the substance is made of simple molecules, this mass may also be called the **relative molecular mass**.

**How to calculate the relative formula mass?**

**Example: **

What is the relative mass formula of hydrogen gas? (Relative atomic mass: H = 1)

**Solution: **

_{2}. Each molecule contains 2 hydrogen atoms.

The relative mass formula of hydrogen gas is

M

_{r}(H

_{2}) = 2 × A

_{r}(H) = 2 × 1 = 2

**Example: **

What is the relative mass formula of water? (Relative atomic masses: H = 1, O = 16)

**Solution: **

_{2}O. Each molecule contains 2 hydrogen atoms and 1 oxygen atom.

The relative mass formula of water is

M

_{r}(H

_{2}O) = 2 × A

_{r}(H) + A

_{r}(O) = 2 × 1 + 16 = 18

**Example: **

What is the relative mass formula of sodium chloride? (Relative atomic masses: Na = 23, Cl = 35.5)

**Solution: **

^{+}Cl

^{-}.

The relative mass formula of sodium chloride is

M

_{r}(NaCl) = A

_{r}(Na) + A

_{r}(Cl) = 23 + 35.5 = 58.5

**How to find the Percent Mass of Elements in a compound?**

How to use M

_{r}to calculate the

**percent mass of an element**in a compound?

**Example: **

What percentage of the mass of ammonium nitrate is nitrogen? (The formula for ammonium nitrate is NH_{4}NO_{3}, Relative atomic masses: H = 1, O = 16, N = 14)

**Solution: **

_{r}(NH

_{4}NO

_{3}) = (2 × 14) + (4 × 1) + (3 × 16) = 28 + 4 + 48 = 80

Mass of nitrogen in the formula = 28

Mass of nitrogen as a fraction of the total =

Mass of nitrogen as percentage of total mass

**Example: **

What percentage of the mass of O in NaNO_{3}? (Relative atomic masses: Na = 23, O = 16, N = 14)

**Solution: **

M_{r}(NaNO_{3}) = 23 + 14 + (3 × 16) = 23 + 14 + 48 = 85

Mass of O as a fraction of the total =

Mass of O as percentage of total mass

**How to find percent by mass and percent composition?**

Example:

Find the percent composition by mass of potassium dichromate (K

_{2}Cr

_{2}O

_{7})

Step 1: Find the molar mass of the compound.

Step 2: Divide the total mass of each element by the molar mass and multiply by 100 to find the % mass.

- Show Step-by-step Solutions

**How find the percent of an element in a compound?**

Finding the percent by mass means finding the mass of the elements in the compound and adding the masses for the total mass.

Example:

You have a 7364 milligrams sample of SO

_{2}. How many grams of sulfur are in the sample?

**How to calculate the Mass Percent of an Element in a Compound?**

Mass Percent Composition of an Element in a Compound

To calculate the mass percent composition (or simply, the mass percent) of an element in a compound, we divide the mass of the element in 1 mol of the compound with the mass of 1 mol of the compound and multiply by 100%.

Examples:

1. What is the mass percent of carbon in carbon dioxide?

2. What is the mass percent of oxygen in carbon dioxide?

- Show Step-by-step Solutions

**How to find the Percent Mass of Water in a compound?**

How to use M

_{r}to calculate the

**percent mass of water**in a compound?

**Example: **

What percentage of the mass of magnesium sulfate is water? (Given that the formula for magnesium sulfate is MgSO_{4}•7H_{2}O, Relative atomic masses: H = 1, O = 16, S = 32, Mg = 24)

**Solution:**

_{r}(MgSO

_{4}•7H

_{2}O) = 24 + 32 + (4 × 16) + (7 × 18) = 246

M

_{r}(H

_{2}

### Define Relative Atomic Mass

O) = 2 × A_{r}(H) + A

_{r}(O) = 2 × 1 + 16 = 18

Mass of water in the formula = 18 × 7 = 126

Mass of water as a fraction of the total =

Mass of hydrogen as percentage of total mass

**How to calculate the Water of Crystallization?**

This video outlines how to determine the percent, by mass, of water trapped in a hydrate's crystal lattice.

Example:

What is the percent of water, by mass, in the hydrate CuSO

_{4}•2H

_{2}O

**How to calculate the percentage of water in the formula of a hydrated compound?**

Example:

Determine the % water in the following hydrates:

a) CuSO

_{4}•5H

_{2}O

b) CaCl

_{2}•2H

_{2}O

c) KAl(SO

_{4})

_{2}•12H

_{2}O

- Show Step-by-step Solutions

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### Relative Atomic Mass Of Oxygen Is 64 Units

Helo, reders welcome to “**textilesgreen.in**” today i m going to explain about **molar mass** of h2o.

i have made this guide to help you out.

So, hold your seat and be with the end of guide.

So you could get valuable information out of it.

lets get started;

**Read More**:- Molar mass of CO2?

## What is molar mass?

### Relative Atomic Mass Of Oxygen Gas

It is define as the mass of sample of that chemical compound divided by the amount of substance in that sample. this phenomenon is called **molar mass**.

It is measured in **moles**.

the molar mass of element it can represent gram atomic mass.

the molar mass of compound it can represent gram molecular mass.

If you want to find the **Molar mass** of chemical compound, such as **h2o** then you can follow this process.

the relative atomicmass of an element expressed in gram is called **gram atomic mass**.

For example;

Gram atomic mass of oxygen is = O = 16g

The relative atomic mass of an compound expressed in grams is called **gram molecular mass.**

For example;

O+O = 16+16 = 32 g

Where, O = oxygen

H+O+H = 1+16+1= 18g

Where, H = Hydrogen and O= oxygen

**Read More**:- Molar Mass of NaCl?

#### You can understand easily with the help of following structure.

You know,

1 unit of hydrogen = one atoms of hydrogen.

1 gram of hydrogen = one mole of hydrogen.

Where,

Value of 1 gram of hydrogen is = 6.022×10 rase power of 23.

Similarly,

About H2O (water)

18 units = one molecule of water

18 gram = one moles of water.

You know that units is much smaller then grams.

## Find the molecular mass of h2o (h2O molar mass)

Find the molecular mass of h2o with the following basic information.

**Such as**,

First of all, You know that,

atomic mass of hydrogen = 1

atomic mass of oxygen = 16

Where, H= Hydrogen or O = oxygen.

In this chemical compound, it has two atom of Hydrogen and one atom of oxygen is present.

So, two Hydrogen = H2= 1+1 = 2.

Where, atomic mass of hydrogen= 1

But here, two Hydrogen is persent in h2o.

So, 1+1 = 2 or multiple by 2, in both cases, it will same meaning. and one oxygen is persent in h20.

it mean, O= oxygen, atomic mass of O = 16

Where,

**Atomic mass of oxygen is 16**

So, For determine the molar mass of h20 add both atomic mass.

Now, atomic mass of h20 = 1+1+16 = 18 gram

So, molar mass of h2o is = 18 gram.

The molar mass of chemical compound is represente by gram molecular mass.

So, it is represente by “**Gram**”

the final result is,

**Molar Mass of h2o is 18 gram.**

**Also read**;

• Full form of h2o

• Nacl full form