1-23 Classify compounds as molecular or ionic

1-23-1. Which of the following is a molecular compound?
A. Na₂S, B. NH₃, C. (NH₄)₂SO₄, D. N₂

1-23-2. Which of the following is an ionic compound?
A. ethyl acetate, B. sulfuric acid,
C. sodium hydrogen carbonate, D. hydrazine

1-23-3. Which of the following is a molecular compound?
A. phosphorus trichloride, B. ammonium chloride
C. lithium aluminum hydride, D. sodium dihydrogen phosphate