Chemistry bundle review

Question

How many moles are in 4.00x10^2 gram of Cesium iodide? How many moles are in 8.76x10^12 molecules of CH4?

Answer 1

Cesium iodide = CsI; molar mass = 259.8 g / mol

4.00x10² g CsI x 1 mol CsI / 259.8 g = 1.5396 mol CsI = 1.54 mol CsI (3 sig. figs.)

8.76x10¹² molecules CH₄ x 1 mol CH₄ / 6.022x10²³ molecules = 1.45x10^-11 moles CH₄