How many oxygen atoms are there in 6.00 g of sodium dichromate,Na₂Cr₂O₇?

Question

Quizplus · Accepted Answer

First, calculate the molar mass of Na₂Cr₂O₇, which is approximately 261.97 g/mol. Then, find the moles of Na₂Cr₂O₇ in 6.00 g: 6.00 g / 261.97 g/mol ≈ 0.0229 mol. Since each molecule of Na₂Cr₂O₇ contains 7 oxygen atoms, multiply the moles of Na₂Cr₂O₇ by 7 to get the moles of oxygen atoms: 0.0229 mol × 7 ≈ 0.1603 mol. Finally, convert moles of oxygen atoms to number of atoms using Avogadro's number (6.022 × 10²³ atoms/mol): 0.1603 mol × 6.022 × 10²³ atoms/mol ≈ 9.65 × 10²² oxygen atoms.

How Many Oxygen Atoms Are There in 6