How many moles of nacl is needed to prepare 67.3g of 21% solution

The total number of moles for making 21% solution is : .

Explanation:

Given :

If a solution is ''% , it means : of the solute is present in of solution.

Here the solvent is water.

∴

21% Solution :

Since the volume of water doesn't change much as the salt dissolves or ionizes ,

we can assume that we have used of has been used for making this solution.

thus will have :

Thus , number of moles :

Answer :

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.