Question

How many moles of water is there in 36gm water if molecular mass of water is 18gm. *

1) 2 mole
2) 1 mole
3) 1.8 mole
4) 1.5 mole​

Answer 1

Explanation:

To go from the mass of water to molecules of water, we have to do two things:

Convert mass of H2O to moles of H2O using the molar mass of H2O as a conversion factor.

Convert moles of H2O to molecules of H2O using Avogadro's number (6.02×10^23) as a conversion factor.

Step 1:

Before we start, I should note that the molar mass of H2O is 18.01gmol.

We can go from mass to moles using dimensional analysis. The key to dimensional analysis is understanding that the units that you don't need any more cancel out, leaving the units that are desired:

36g×1mol/18.01g

=2.00mol

Step 2:

We'll use the following relationship:

Using the moles of H2O

that were just obtained, we can use Avogrado's number to perform dimensional analysis to cancel out units of mol to end up with molecules: 2.00mol×(6.02×10^23 molecules/1mol)

=1.204×10^24molecules

Thus, 36g of water is equivalent to

1.2×10^24molecules

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Answer 2

Answer:

First answer is right...