Home/Introduction To Fundamental
Stoichiometry
Question#1
The right option for mass of CO2 produced by heating 20g of 20% pure lime is NEET2023
\( CaCO_3 \rightarrow CaO + CO_2 \)
\( CaCO_3 \Longrightarrow CaO + CO_2 \) \( mass \ of\ Pure\ CaCO_3 = 20 \times \frac{20}{100} = 4g \)
So,
\( 100g \ CaCO3 \rightarrow 44g \ CO_2 \)
\( 1g \ CaCO3 \rightarrow \frac{44}{100} \ CO_2 \)
\( 4g \ CaCO3 \rightarrow \frac{44}{100} \times 4g \ CO_2 \)
\( \rightarrow 1.76g \ CO_2 \)
Question#2
1.5 mol of O2 combine with Mg to form oxide MgO . The mass of Mg (at. mass 24) that has combined is [KCET 2001]
Question#3
H 2 evolved at STP on complete reaction of 27 g of Aluminium with excess of aqueous NaOH would be [CPMT 1991]
Question#4
If \(1 \frac{1}{2} \) moles of oxygen combine with \( Al \) to form \( Al_2O_3 \) the weight of \( Al \) used in the reaction is (Al=27) [EAMCET 1980]
Question#5
Stoichiometry is NUMS-2021