<u>Answer:</u> The mass of water that would form is 11.52 grams
<u>Explanation:</u>
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