Question

A snowflake contains 1.9 1018 molecules of water. how many moles of water does it contain?

Answer 1

To find the number of moles of water in the snowflake, we can use Avogadro's number and the molar mass of water. By dividing the number of molecules of water by Avogadro's number, we can find the number of moles. The snowflake contains approximately 3.16 x 10^-6 moles of water.

Step-by-step explanation:

To find the number of moles of water, we need to use the concept of Avogadro's number and the molar mass of water. Avogadro's number is approximately 6.022 × 10^23, which represents the number of particles in one mole of any substance. The molar mass of water (H2O) is 18.015 g/mol, which means that one mole of water weighs 18.015 grams.

Given that the snowflake contains 1.9 × 10^18 molecules of water, we can use this information to find the number of moles.

moles of water = number of molecules / Avogadro's number = 1.9 × 10^18 / (6.022 × 10^23) ≈ 3.16 × 10^-6 moles

Answer 2

3.16× 10^40 moles.

Step-by-step explanation:

Before we dive Right into the question, let us take one or two facts down. From the question, we know that we are to find the number of moles of water that the snowflake contains.

MEANING OF MOLE: A mole is an SI unit usually represented as 'mol'. A mole can be defined as the mass of substance containing the same number of elementary units as there are atoms in exactly 12grams of carbon-12.

ADDITIONAL INFORMATION:

One mole of any substance contains 6.02214076 × 10^23 of either molecules, ions, electrons or atoms. This value is exactly the value given for Avogrado's constant.

SOLVING THE QUSTION: Therefore, from the above explanations, we can see that;

One mole of any substance= 6.02214076 × 10^23 molecules.

That is;

One mole of snowflake= 6.02214076 × 10^23 molecules.---------------------------------------------------(1).

X moles= 1.9 × 10^18 molecules. ------------------------------------------------(2).

Hence, combination of equation (1) and (2) gives;

1.9×10^18/6.02214076 × 10^23.

= 3.16× 10^40 moles