Massa 14 gas nitrogen (P, T) adalah 1,12 g dan massa 4 L gas X pada P, T tersebut adalah 7,36 g, maka Mr gas X adalah … g mol^-1.

Massa 14 gas nitrogen (P, T) adalah 1,12 g dan massa 4 L gas X pada P, T tersebut adalah 7,36 g, maka Mr gas X adalah … g mol^-1.
a. 46
b. 38
c. 32
d. 30
e. 24

Izin mengoreksi ya, mungkin yang dimaksud di soal adalah massa 14 L gas nitrogen adalah 1,12 g.

Jawaban yang benar adalah 644 gram/mol (tidak ada opsi jawaban benar).

Hukum Avogadro menyatakan bahwa pada tekanan dan suhu tetap, volume suatu gas berbanding lurus dengan jumlah mol gas.
V N₂ ÷ n N₂ = V X ÷ n X
V N₂ ÷ (massa N₂ ÷ Mr N₂) = V X ÷ (massa X ÷ Mr X)
14 L ÷ (1,12 gram ÷ 28 gram/mol) = 4 L ÷ (7,36 gram ÷ Mr X)
14 L ÷ 0,04 mol = 4 L ÷ (7,36 gram ÷ Mr X)
Mr X = (7,36 gram × 14 L) ÷ (0,04 mol × 4 L)
Mr X = 644 gram/mol

Jadi, Mr gas X adalah 644 gram/mol.

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