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5) How many moles does 80 grams of H2) represent?

The molar mass of water can be calculated by adding molar mass of the individual elements:

1 g/mol + 1 g/mol + 16g/mol = 18 g/mol of H2O

We need to calculate moles in 80 gram of water, therefore,

80 g H2O × 1mol H2O/18g H2O

= 4.44 mol H2O

6) What is the mass of 2.0 moles of LiOH?

The mass can be calculated by multiplying number of moles by its molar mass. In this case,

n = 2.0, and

molar mass = 23.95g/mo

We know that

mass = n × molar mass.

= 2.0mol × 23.95g/mo

= 48g

7). How many atoms does 2.0 moles of He represent?

The number of atoms can be calculated by using the formula

n (mol) = number of atoms / avogadro's number ()

We can write it as follows,

number of atoms of He = n (mol) ·

We know that is equal to 6.02X10^23. Hence, the total number of atoms can be calculated as follows,

number of atoms of He = 2.0 moles X (6.02X10^23)

= 12.04X10^23 atoms

8). Convert 3.01x10^23 molecules of C2H6 to moles.

Number of molecules (N) can be converted to the number of moles (n) using the following formula

By putting values,

= 3.01x10^23 / 6.02X10^23

= 0.5 moles

9). What would be the mass of 1.20 x 10^24 molecules of water?

To calculate the mass, we will first need to calculate the number of moles of water using following formula,

number of moles = number of molecules / avogadro's number.

number of moles =  1.20x10^24 / 6.02x10^23

number of moles = 1.99.

Then, we will multiply number of moles of water by water's molecular mass.

mass = 1.99 x  18.0 g/mol

mass = 35.8 g water

10) How much mass does 1.51 x 10^22 atoms of neon represent?

The total mass can be calculated using the following approach,

mass = number of atoms x (1 mole / avogadro's number) x neon molecular mass

= 1.51x10^22 atoms x (1 mole / 6.022x10^23 atoms) x (20.18 g/mole)

= 0.503 g Ne

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