A chemical formula is provided. How many atoms of hydrogen (H) are found in this substance? (NH4)2CO3

Group of answer choices

A.2

B.4

C.6

D.8

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added

Magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. trial 1: trial 2: data mass of empty crucible with lid trial 1: 26.688 trial 2: 26.681 mass of mg metal, crucible, and lid trial 1: 26.994 trial: 2 26.985 mass of mgo, crucible, and lid trial 1: 27.188 trial 2: 27.180