Work from the known mass and molar ratios of the equation.
As a “stoichiometry” question we will assume that all compounds are in the exact amounts, as shown by the equation. Given the molar quantities, we can work backwards from the one given mass quantity to find the rest of the component values.
The given stoichiometric equation shows that includes 9 moles of
Adjusting that for the given amount of 2.75 moles, each atomic factor must be reduced by
That means in our actual reaction we have
Converting those to masses we obtain: