Calculate the number of moles in 2.28 g Rb₂C₂O₄.

Question

Quizplus · Accepted Answer

First, we need to determine the formula weight of Rb₂C₂O₄. Rb: 1 atom x 85.47 g/mol = 85.47 g/mol S: 2 atoms x 32.06 g/mol = 64.12 g/mol U: 3 atoms x 238.03 g/mol = 714.09 g/mol B: 24 atoms x 10.81 g/mol = 259.44 g/mol C: 1 atom x 12.01 g/mol = 12.01 g/mol O: 1 atom x 15.99 g/mol = 15.99 g/mol Formula weight = 1205.12 g/mol Next, we can use the formula: moles = mass / formula weight moles = 2.28 g / 1205.12 g/mol moles = 0.001893 mol Rounding to two significant figures, the answer is 0.0019 mol, which is closest to C) 11eab077_f83c_0029_beed_31ec10fb7809_TB6421_11 mol.

Calculate the Number of Moles in 2