How many shared pairs are there in a nitrite ion and what is it's shape?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

What metric units would you use to measure the thickness of a key

Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that