Trisilane (Si3H8) is a liquid with a density of 0.739 g cm-3. It reacts with oxygen to give silicon dioxide (SiO2) and water. Calculate the mass of water that would form if 20.0 cm3 of trisilane reacted completely with excess oxygen.

The mass of water that would form is 11.52 grams

Explanation:

To calculate the mass of trisilane, we use the equation:

Density of trisilane =

Volume of trisilane =

Putting values in above equation, we get:

To calculate the number of moles, we use the equation:

    .....(1)

Given mass of trisilane = 14.78 g

Molar mass of trisilane = 92.3 g/mol

Putting values in equation 1, we get:

The chemical equation for the reaction of trisilane and oxygen gas follows:

By Stoichiometry of the reaction:

1 mole of trisilane produces 4 moles of water

So, 0.160 moles of trisilane will produce = of water

Now, calculating the mass of water by using equation 1, we get:

Moles of water = 0.64 moles

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

Hence, the mass of water that would form is 11.52 grams

that's what i got you can count the number of atoms