Question

What is the empirical formula of p2o5 and molecular mass of 567.8 grams

Answer 1

Answer:

$P_8O_{20}$

Explanation:

First, let's get the mass of the empirical formula and compare to the molecular mass.

$P_2O5 = 2 \times (30) + 5 \times (16) = 140 g$

Now that we have the mass we can estimate how many times the Empirical Formula fits inside the Molecular Formula. We do this by dividing:

$567.8 \div 140 = 4$

This means that the Molecular Formula is actually four times the Empirical Formula. With that in mind we can multiply the formula and get the empirical.

$4 \times P_2O_5 = P_8O_{20} = 567.78 g$