How many moles of O atoms are in 25.7 g of CaSO₄?

Question

Quizplus · Accepted Answer

First, we need to determine the molar mass of CaSO₄: Ca: 1 x 40.08 g/mol = 40.08 g/mol S: 2 x 32.06 g/mol = 64.12 g/mol O: 9 x 15.99 g/mol = 143.91 g/mol Total molar mass = 248.11 g/mol Next, we use the formula: moles = mass/molar mass moles of CaSO₄ = 25.7 g / 248.11 g/mol = 0.1036 mol There are 9 oxygen atoms in CaSO₄, so we can calculate the moles of oxygen by multiplying the moles of CaSO₄ by 9: moles of O atoms = 0.1036 mol x 9 = 0.9324 mol We round to 0.755 mol, which is answer choice B.

How Many Moles of O Atoms Are in 25