Quantitative Aspects of chemical change

The CORRECT chemical formula for potassium nitrate is …

• 7 atoms.

• 1 molecule.

Avogadro's number is equal to the number of …

• atoms in 1 mole CO.

• molecules in 1 mole Au.

• A

• B

• C

• D

• 1 molecule of P.

• 4 molecules of P.

16 gram of oxygen gas at STP occupies …

Which one of the following gases has the highest volume at STP?

Which of the following represents a mole?

• 18,02 g of water

• 22,4 g of nitrogen gas at STP

• 3,2 g of oxygen gas

2 g Hydrogen gas, 2 g Oxygen gas and 2 g Carbon dioxide gas are sealed in the same container with fixed walls. Which of the statements below is correct regarding the number of moles in the container?

• Hydrogen gas is in excess in the container.

• Oxygen gas is in excess in the container.

• Carbon dioxide is in excess in the container.

• There are equal numbers of moles of each gas in the container.