What is the empirical formula of a phosphoric acid that contains 0.3086 g of hydrogen, 3.161 g of phosphorus, and 6.531 g of oxygen?

The empirical formula is

Explanation:

Given:

Mass of H = 0.3086 g

Mass of P = 3.161 g

Mass of O = 6.531 g

Step 1 : convert given masses into moles.

Moles of H=

Moles of P=

Moles of O =

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For H=

For P=

For O =

The ratio of H:P:O= 3: 1: 4

Hence the empirical formula is

4

explanation:

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b