Moles Concept

How many gram is 0.5 mol of Copper atoms? [Cu: 63.5gmol^-1]

• 63.5 g

• 6.35

• 31.75

• 3.175

How many molecules are in 2.00 moles of H₂O?

• 124 x 10²⁴ molecules of H₂O

• 1.20 x 10²³ molecules of H₂O

• 12.04 x 10²³ molecules H₂O

• 124

How many atoms are there in a (NH₄)₂ HPO₄ molecule?

• 11

• 5

• 16

• 8

A scientists analyzed an unknown sample and determined that it contained 5 moles of oxygen and 2 moles of nitrogen? Which of the following would be its molecular formula?

• N₂O₅

• N₄O

• NO

• O₂N₅

What is the mol number of 250 g CaCO₃ ?

[Ca: 40 gmol^-1, C: 12 gmol^-1, O: 16 gmol^-1]

• 1.5 mol

• 1.0 mol

• 2.5 mol

• 2.0 mol

How many atoms are there in 2.2 mole of NaOH atom?

• 6.6 mol of atoms

• 2.2 mol of atoms

• 3 mol of atoms

• 4 mol of atoms

What is the mole number of Mg(OH)₂ that contains 16 moles of hydrogen atom?

• 8 mol

• 2 mol

• 16 mol

• 32 mol

How many moles of atoms are there in 2.5 mole of CaSO₄?

• 2.5 mol

• 5 mol

• 10 mol

• 15 mol

What is the mass of 0.2 mol of Al? [Al: 27gmol^-1]

• 27 g

• 54 g

• 5.4 g

• 2.7 g

How many atoms are there in 12.04 x 10²³ molecules of NaOH?

• 12.04 x 10²³

• 36.12 x 10²³

• 36.12 x 10²⁴

• 12.04 x 10²³