Stoichiometry, Limiting Reagent & Empirical Formula

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1.
2 mol of SO2 and 1 mol of O2 are mixed. The maximum moles of SO3 formed are (2SO2 + O2 -> 2SO3):
2.
5 g of CaCO3 on heating gives CO2. The volume of CO2 at STP is:
3.
A compound contains 40% C, 6.67% H, and 53.33% O. Its empirical formula is:
4.
The empirical formula of a compound is CH2O and its molar mass is 180 g/mol. The molecular formula is:
5.
In the reaction N2 + 3H2 -> 2NH3, 28 g of N2 reacts with 6 g of H2. Which is the limiting reagent?

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