Question

Mole-Mass Conversions

How many moles in 28.o grams of Oxygen?




What is the mass of 5.0 moles of Iron?




Find the number of moles of argon in 452 g of argon.





Find the grams in 16.5 mol of Hydrogen.

Answer 1

To find the number of moles in a given mass of a substance, divide the mass by the molar mass. To find the mass of a given number of moles of a substance, multiply the number of moles by the molar mass.

Step-by-step explanation:

To find the number of moles in a given mass of a substance, we use the formula:

moles = mass / molar mass

For example:

1. To find the number of moles in 28.0 grams of oxygen:

moles = 28.0 g / 32.00 g/mol (molar mass of oxygen)

moles = 0.875 mol

2. To find the mass of 5.0 moles of iron:

mass = 5.0 mol * 55.85 g/mol (molar mass of iron)

mass = 279.25 g

3. To find the number of moles of argon in 452 g of argon:

moles = 452 g / 39.95 g/mol (molar mass of argon)

moles = 11.31 mol

4. To find the grams in 16.5 mol of hydrogen:

mass = 16.5 mol * 1.01 g/mol (molar mass of hydrogen)

mass = 16.665 g

Answer 2

1.) 28.0 grams of oxygen
28 grams (1 mole/16 grams per mole)=1.75 moles oxygen
2.)5.0 moles of Iron
5 moles(55.845 grams/1 mole)=279.225 grams Iron
3.) 452 grams Argon
452 grams(1 mole/39.948 grams)=11.315 moles Argon
4.) 16.5 moles Hydrogen
16.5 moles(1.01 grams/1 mole)=16.665 grams Hydrogen