Question

What is the simplest formula of a compound if a sample of the compound contains 0.257 mol X, 1.028 mol Y, and 1.799 mol Z?
How many moles of Z would be in a sample that contained 0.648 mol X?

Answer 1

Answer -

Given,

X = 0.257 mol

Y = 1.028 mol

Z = 1.799 mol

Simplest Formula or Empirical Formula = ?

moles of Z in sample is moles of X is 0.648 mol = ?

Divide each by the smallest among them,

For X = 0.257 mol / 0.257 mol = 1

For Y = 1.028 mol / 0.257 mol = 4

For Z = 1.799 mol / 0.257 mol = 7

So, Simplest Formula = X₁Y₄Z₇ [ANSWER]

Now,

moles of Z is 7 times the moles of X in the sample

So, when X = 0.648 mol

Z = 7 * 0.648 mol

Z = 4.536 mol [ANSWER]