150microlitres of solution A at 2.66micromoles concentration was added to Xmillilitres of water to produce 40millilitres of 10micromoles of malachite green. Find X

B:H ratio is 1:3

Explanation:

The empirical formula is BH₃.

If you have 100 g of the compound.

Then you have 78.14 g B and 21.86 g H.

Now, we must convert these masses to moles and find their ratios.

From here on, I like to summarize the calculations in a table.

Element  Mass/g    Moles     Ratio     Integers

    B          78.14      7.2285    1                    1

    H          21.86    21.686      3.0001          3

The empirical formula is BH₃.