How many O atoms are there in 51.4 g CaSO₄? A)4 B)2.40 * 10²⁴ C)1.13 D)9.09 * 10²³ E)2.28 * 10²³

Question

Quizplus · Accepted Answer

To determine the number of O atoms in CaSO₄, we need to find the number of moles of the compound first. molar mass of CaSO₄ = 40.08 + 32.06 + (16.00 x 2) + (32.06 x 1) + (1.008 x 4) + (14.01 x 1) = 150.19 g/mol moles of CaSO₄ = 51.4 g / 150.19 g/mol = 0.342 moles From the molecular formula, there are 9 O atoms in one formula unit of CaSO₄. O atoms in 0.342 moles of CaSO₄ = 0.342 mol x 9 O atoms/mol = 3.078 O atoms Rounding to the nearest whole number, we get 3 O atoms. Therefore, the best choice is D) 9.09 F1F1F1S1F1F1F10 10²³ (rounded to the nearest whole number).

How Many O Atoms Are There in 51