کیمیا کے بنیادی تصورات

What is the relative atomic mass of oxygen?

• 1 16
• 2 2
• 3 32
• 4 8

How many atoms are present in one molecule of H2SO4?

• 1 3
• 2 9
• 3 5
• 4 7

What is the mass of one mole of water, H2O? (H = 1, O = 16)

• 1 20 g
• 2 18 g
• 3 34 g
• 4 16 g

The number of particles in one mole of any substance is:

• 1 3.01 x 10^23
• 2 1.2 x 10^24
• 3 6.02 x 10^22
• 4 6.02 x 10^23

A substance made of only one kind of atom is called:

• 1 A solution
• 2 A mixture
• 3 An element
• 4 A compound

How many moles are there in 36 g of water? (molar mass 18 g/mol)

• 1 3
• 2 2
• 3 0.5
• 4 1