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    Delhi Public School Ruby Park Assignment On Some Basic Concepts in Chemistry

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    This document contains 30 chemistry questions covering various concepts including: - Laws of chemistry such as conservation of mass, definite proportions, and multiple proportions. - Gas laws including Gay-Lussac's law and Avogadro's law. - Stoichiometry problems involving the reaction of elements to form compounds. - Calculations involving moles, molarity, molality, and mole fraction in solution chemistry. - Limiting reagents and percent composition in chemical reactions.

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    Delhi Public School Ruby Park Assignment On Some Basic Concepts in Chemistry

    Uploaded by

    Ab Cd
    295 views1 page
    This document contains 30 chemistry questions covering various concepts including: - Laws of chemistry such as conservation of mass, definite proportions, and multiple proportions. - Gas laws including Gay-Lussac's law and Avogadro's law. - Stoichiometry problems involving the reaction of elements to form compounds. - Calculations involving moles, molarity, molality, and mole fraction in solution chemistry. - Limiting reagents and percent composition in chemical reactions.

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    HHW Chemistry 11

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    This document contains 30 chemistry questions covering various concepts including: - Laws of chemistry such as conservation of mass, definite proportions, and multiple proportions. - Gas laws including Gay-Lussac's law and Avogadro's law. - Stoichiometry problems involving the reaction of elements to form compounds. - Calculations involving moles, molarity, molality, and mole fraction in solution chemistry. - Limiting reagents and percent composition in chemical reactions.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    295 views1 page

    Delhi Public School Ruby Park Assignment On Some Basic Concepts in Chemistry

    Uploaded by

    Ab Cd
    This document contains 30 chemistry questions covering various concepts including: - Laws of chemistry such as conservation of mass, definite proportions, and multiple proportions. - Gas laws including Gay-Lussac's law and Avogadro's law. - Stoichiometry problems involving the reaction of elements to form compounds. - Calculations involving moles, molarity, molality, and mole fraction in solution chemistry. - Limiting reagents and percent composition in chemical reactions.

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    © All Rights Reserved
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    Delhi Public School Ruby Park

    Assignment on Some basic concepts in Chemistry


    Q1. State (a) Law of conservation of mass, (b) Law of definite proportion (c) Law of multiple proportions (d) Gay Lussac’s
    law of gaseous volume (e) Avogadro’s law
    Q2. A metal forms two oxides. The higher oxide contains 80% metal. 0.72 g of the lower oxide gave 0.8 g of higher oxide
    when oxidized. Show that the data illustrates the law of multiple proportions.
    Q3. Equal masses of oxygen, hydrogen and methane are taken in a container in identical conditions. Find the ratio of the
    volumes of the gases.
    Q4. The atomic masses of two elements (A and B) are 20 and 40 respectively. If x g of A contains y atoms, how many
    atoms are present in 2x g of B?
    Q5. How many atoms are there in 100amu of He?
    Q6. How many g atoms are there in one atom?
    Q7. Insulin contains 3.4% sulphur. Calculate minimum molecular weight of insulin.
    Q8. Calculate the total number of atoms in 0.5 mole of potassium dichromate.
    Q9. What is the maximum number of moles of CO2 that could be obtained from the carbon in 4 moles of Ru2(CO3)3?
    Q10. 4g H2 reacts with 20g O2 to form water. How much water is formed?
    Q11.It was found that 380mL of a gas at 27◦C and 800mm of Hg weighed 0.455g. Find the molecular weight of the gas.
    Q12.How many grams of MgSO4 would contain the same mass of sulphur that is present in 200g of FeSO4?(Mg=24,
    Fe=56, S=32,O=16)
    Q13.How many moles of Al2O3 will be formed when a mixture of 5.4 g of Al and 3.2 g of O2 is heated ? [ Al = 27, 0 = 16]
    Q14. The vapour density of a mixture containing NO2 and N2O4 is 38.3 at 27◦C. Calculate the mole of NO2 in 100g
    mixture.
    Q15. What is the simplest formula of a compound containing 50% of element A(atomic mass10) and 50% of element
    B(atomic mass 20)?
    Q16. Calculate the amount of KClO3 needed to supply sufficient oxygen for burning 112 L of CO gas at S.T.P. (Atomic
    weight of K = 39, Cl = 35.5, O = 16).
    Q17. When 15g of a mixture of NaCl and Na2CO3 is heated with dil HCl, 2.5g of CO2 is evolved at STP. Calculate %
    composition of the original mixture.
    Q18. Brass is an alloy of Cu-Zn. A sample of brass weighing 6g when treated with excess of dil H2SO4 gives 328mL of dry
    hydrogen gas at 27◦C and 760mm Hg pressure. What is the % of copper by weight in the alloy? (Atomic mass of zinc is
    65.4g, R= 0.082L atm K-1 mol-1)
    Q19. Calculate the weight of CaO required to remove hardness of 166 L of water containing 1.62g of Ca(HCO3)2 in 1L.
    Q20. A closed vessel is found to contain 1g of Mg and 0.5g of oxygen. The mixture is burnt. (a) which is the limiting
    reagent? (b) Find the weight of the excess reagent. (c) How many mL of M/4 solution of H2SO4 will dissolve the residue in
    the vessel?
    Q21. Define (a) molarity, (b) molality, (c) mole fraction, (d) limiting reagent.
    Q22. Calculate the number of sulphate ions in 100mL of 0.001M H2SO4 solution.
    Q23. Concentration of glucose in blood is approximately 90 mg / 100 ml. Find the molarity of glucose solution in blood .
    Q24.A solution of glucose in water is labelled as 10% (w/w). The density of the solution is 1.20 g/mL. Calculate molality,
    molarity and mole fraction of each component in solution.
    Q25. Calculate the molality of solution of ethanol in water in which the mole fraction of ethanol is 0.04.
    (density of water = 1g/cc)
    Q26. If the density of methanol is 0.8 kg L-1, what is its volume needed for making 2.5 L of its 0.25 M solution ?
    Q27. A commercial sample of oxalic acid is labeled as 22.5% by w/w (density 1.5g/cc). Calculate (a) molarity (b) volume
    of acid required to prepare 1L of 0.2 M oxalic acid, H2C2O4.
    Q28. The density of 3M solution of NaCl is 1.25g/mL. Calculate the molality of the solution.
    Q29 What volume of 10M HCl and 3M HCl should be mixed to obtain 1L of 6M HCl solution?
    Q30. How are 0.5 mol Na2CO3 and 0.50 M Na2CO3 different ?

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