Calculate the mass of N in 2.34 g of N₂H₄

Question

Quizplus · Accepted Answer

N₂H₄ represents a sequence of elements (N, S, H, U, B) and numbers indicate the number of atoms in each element. Therefore, the total mass of N can be calculated as follows: - Determine the molar mass of N₂H₄: N: 1 x 14.01 g/mol = 14.01 g/mol S: 1 x 32.06 g/mol = 32.06 g/mol H: 1 x 1.01 g/mol = 1.01 g/mol U: 3 x 238.03 g/mol = 714.09 g/mol B: 3 x 10.81 g/mol = 32.43 g/mol Total molar mass = 793.60 g/mol - Calculate the moles of N₂H₄ in 2.34 g: moles = mass/molar mass moles (N₂H₄) = 2.34 g/793.60 g/mol = 0.00295 mol - Determine the mass of N in 0.00295 mol: mass (N) = moles (N) x molar mass (N) mass (N) = 0.00295 mol x 14.01 g/mol = 0.04124 g or 2.05 g (rounded to two decimal places) Therefore, the answer is D.

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