mol yang sama, 2 gram H2 dengan 16 gr O2 (Ar O=16;H=1), 23 gram Na dengan 24 gr Mg (Ar Na=23;Mg=24), 22,4 L CO2 dan 44,8 L SO3 STP, Gas oksigen (O2) memiliki Mr = 32. Jika massanya 64 gram, volume pada kondisi STP adalah ... (1 mol gas = 22,4 liter), 11,2 liter, 22,4 liter, 44,8 L, 5,6 L, 6,72 L, Reaksi: N2 + 3H2 → 2NH3 Jika tersedia 3 mol H2, volume NH3 yang terbentuk pada STP adalah ..., 22,4 L, 44,8L, 6,72 L, 5,6 L, 33,6 L, Boron nitrida merupakan bahan yang sangat keras dan dapat dibuat melalui reaksi: B2O3 + NH3 → BN + H2O (belum setara). Jika 14 gram B2O3 (Mr = 70) dan 9,5 gram NH3 (Mr = 17), massa boron nitrida (Mr = 25) yang dihasilkan adalah ..., 5 gr, 7,5 gr, 10 gr, 15 gr, 30 gr.
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