Answer to Question #12743 in Chemistry for Molly

Question

In an experiment, 0.520 g of chromium metal reacts with 3.807 g of iodine. Using the conservation of mass law, predict the mass of product.


2 Cr(s) + 3 I2(s) 2 CrI3(s)

Answer 1

n of Cr 0.52/52 = 0.01 mol
n I₂ 3.807/(127*2) = 0.015 mol

0.01 0.015 x
2Cr(s) + 3I₂(s) --> 2CrI₃(s)
2 3 2

x = 0.01 mol

m = 0.01* (52+3*127) = 4.33 g