Which of the following best describes a chain reaction? select one: a. neutrons from splitting atoms continue to split other atoms, releasing more neutrons. b. chemicals released from splitting atoms cause other atoms to split. c. splitting atoms bump into neighboring atoms, causing them to split. d. a splitting atom causes the atom directly beside it to also split.

c. Splitting atoms bump into neighboring atoms.

The number of moles represented by 21.7 L is 0.96875 moles

Explanation:

The volume occupied by one mole of a gas which consists of (approximately) 6.022 × 10²³ elementary at STP is 22.4 L. The volume is known as the molar volume of gas

Therefore, the number of moles, 'n', present in 21.7 L of gas at STP is given as follows;

The number of moles represented by 22.4 L = 1 mole

∴ The number of moles represented by 21.7 L = 1 mole/22.4 L × 21.7 L = 0.96875 moles

The number of moles represented by 21.7 L = 0.96875 moles.