What mass of nitrogen gas is required to react completely with excess hydrogen gas to produce 13.6 g of ammonia?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

What is the percentage of hydrogen in nitrogen trihydride

What is the correct name for the compound cocl3? a) cobalt(i) chloride b) cobalt(i) chlorate c) cobalt(ii) chlorate d) cobalt(iii) chloride