Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202523 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
23 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JEE Main 2025 · 23 January · Evening Shift · Chemistry · Some Basic Concepts of Chemistry

When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen...

When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is_______ - (Nearest integer) Given : Molar mass of Al is 27.0 g mol−127.0 \mathrm{~g} \mathrm{~mol}^{-1} Molar mass of O is 16.0 g mol−116.0 \mathrm{~g} \mathrm{~mol}^{-1}

Correct answer

0

Step-by-step solution

4Al+3O2⟶2Al2O38127=3 mole 12832=4mole\begin{aligned} & 4 \mathrm{Al}+3 \mathrm{O}_2 \longrightarrow 2 \mathrm{Al}_2 \mathrm{O}_3 \\ & \frac{81}{27}=3 \text{ mole } \frac{128}{32}=4 \mathrm{ mole}\end{aligned} Limiting reagent ∴ mole of Al2O3 formed =12×3 mole ∴ wt. of Al2O3 formed =32×102=153gm\begin{aligned} & \therefore \text{ mole of } \mathrm{Al}_2 \mathrm{O}_3 \text{ formed }=\frac{1}{2} \times 3 \text{ mole } \\ & \therefore \text{ wt. of } \mathrm{Al}_2 \mathrm{O}_3 \text{ formed }=\frac{3}{2} \times 102 \\ & \quad=153 \mathrm{gm} \end{aligned}
Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg… JEE Main 2026Which of the following contain the same number of atoms ? (Given : Molar mass in g mol ^… JEE Main 2026An oxide of iron contains 69.9\% iron, its empirical formula, is: (Given: Molar mass of… JEE Main 2026What volume of hydrogen gas at STP would be liberated by action of 50 mL of H_2SO_4 of… JEE Main 2026How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given… JEE Main 2026The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684… JEE Main 2026Number of moles and number of molecules in 1.4187 L of SO_2 at STP respectively are: JEE Main 2026The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1 . It has two… JEE Main 2026 Full Some Basic Concepts of Chemistry list All JEE Main PYQs