Avogadro constant and moles - OCR Gateway

1

How many carbon atoms are there in 12.0 g of carbon-12?

2

How many atoms are there in a molecule of ammonia, NH3?

3

How many atoms are there in 0.2 mol of methane molecules, CH4?

4

What is the mass of one silicon atom (relative atomic mass = 28.1)?

5

What is the molar mass of glucose, C6H12O6 (relative formula mass = 180.0)?

6

What is the amount, in mol, of oxygen atoms in 8.0 g of oxygen atoms (relative atomic mass = 16.0)?

7

What is the mass of 0.75 mol of hydrogen molecules (relative formula mass = 2.0)?

8

Magnesium reacts with dilute hydrochloric acid. When the reaction is complete, some magnesium is still visible. What does this mean?

9

Hydrogen reacts with oxygen to produce water: H2 + 2O2 → 2H2O. What is the maximum mass of oxygen that will react with 6.0 g of hydrogen? (Relative formula masses: H2 = 2.0, O2 = 32.0)

10

In a reaction, 1.0 mol of copper reacts with 0.25 mol of oxygen to form 0.50 mol of copper oxide. What is a correct balanced equation for this reaction?