Why is only one molecule of n2 needed to produce 2 molecules of nh3?

a. because nitrogen is generated
b. because there are no nitrogen molecules in the atmosphere
c. because nh3 does not always contain nitrogen
d. because each nitrogen molecule contains two nitrogen atoms

The rock in a lead ore deposit contains 89 % pbs by mass. how many kilograms of the rock must be processed to obtain 1.5 kg of pb?

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol