How many grams of O₂ are required to react completely with 14.6 g of Na to form sodium oxide, Na₂O?

The most plausible answer is b, duration. the given amount of time is considered how long it last for.

16- counting by fours

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.