Intro Chemistry

Question

How many grams of Cs are there in a sample of Cs that contains the same number of miles as a 109 gram sample of Sn

Answer 1

First, we need to establish how many moles are in a 109 gram sample of SN. Sn is abbreviation for Tim and is in Group 14 (IVa) on the Periodic Table with a molecular weight of 118.71 grams.

109 grams x 1 mole/118.71 grams = 0.91820 moles of Tin

This will be the same number of moles we will have in the Cesium sample. Cesium has a molecular weight of 137.911 grams per mole.

0.91820 moles of Tin x 137.911/1 mole = 126.63 grams.

Using significant figures, we have 126 grams of Cesium.