How do you calculate the percentage of water on Earth?

Divide the mass of the water lost by the mass of hydrate and multiply by 100. The theoretical (actual) percent hydration (percent water) can be calculated from the formula of the hydrate by dividing the mass of water in one mole of the hydrate by the molar mass of the hydrate and multiplying by 100.

Where is most of the water on Earth found percentage?

The ocean
The ocean holds about 97 percent of the Earth’s water; the remaining three percent is found in glaciers and ice, below the ground, in rivers and lakes. Of the world’s total water supply of about 332 million cubic miles of water, about 97 percent is found in the ocean.

What percentage of the Earth’s mass is water?

Although water covers 70 percent of the Earth’s surface, water is actually a rare substance that represents just 0.05 percent of the Earth’s total mass.

How do you find the formula of a hydrate?

Steps to Finding the Formula of a Hydrate

1. Determine the mass of the water that has left the compound.
2. Convert the mass of water to moles.
3. Convert the mass of anhydrate that is left over to moles.
4. Find the water-to-anhydrate mole ratio.
5. Use the mole ratio to write the formula.

What is the percentage composition of water?

The percentage of an element in a compound is 100 times the fraction, so for water the mass percent hydrogen is 11.11\% and the mass percent oxygen is 88.89\%.

How much water is in the sky?

According to meteorologists, water vapor averages 0.04\% of the volume of Earth’s atmosphere. That means the sky holds 4,824,146,196 gallons of water. At eight pounds per gallon, that’s another 38,593,169,564 pounds of water in the air.

How do you find the number of waters of hydration?

Now, the difference between the mass of the hydrate and the mass of the anhydrous salt will be equal to the mass of water of hydration. The number of waters of hydration is given by the number of moles of water present for every 1 mole of anhydrous salt.

What does hexahydrate mean?

Definition of hexahydrate : a chemical compound with six molecules of water.

How do you find the percent composition?

Percent Composition

1. Find the molar mass of all the elements in the compound in grams per mole.
2. Find the molecular mass of the entire compound.
3. Divide the component’s molar mass by the entire molecular mass.
4. You will now have a number between 0 and 1. Multiply it by 100\% to get percent composition.

How do you find the simplest ratio of water?

Answer: For water, the molecule is made up of two hydrogen atoms and one oxygen atom, so its molecular formula is H2O. This also represents the simplest ratio of atoms in the molecule, so its empirical formula is H2O. So water’s molecular and empirical formulae are the same.