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3 Ca + N 2 → Ca 3 N 2. It reacts with water or even the moisture in air to give ammonia and calcium hydroxide: [4] Ca 3 N 2 + 6 H 2 O → 3 Ca(OH) 2 + 2 NH 3. Like sodium oxide, calcium nitride absorbs hydrogen above 350 °C: Ca 3 N 2 + 2 H 2 → 2 CaNH + CaH 2