logo

CuriousTab

CuriousTab

Discussion


Home General Knowledge Chemistry Comments

  • Question
  • What are the number of moles of CO2 which contains 16 g of oxygen?


  • Options
  • A. 0.5 mole
  • B. 0.2 mole
  • C. 0.4 mole
  • D. 0.25 mole

  • Correct Answer
  • 0.5 mole 

    Explanation
    One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.

  • Chemistry problems


    Search Results


    • 1. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

    • Options
    • A. carbon
    • B. hydrogen
    • C. oxygen
    • D. nitrogen
    • Discuss
    • 2. The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

    • Options
    • A. p-electrons in Ne(Z = 10)
    • B. s-electrons in Mg(Z = 12)
    • C. d-electrons in Fe(Z = 26)
    • D. p-electrons in CI(Z = 17)
    • Discuss
    • 3. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

    • Options
    • A. chain isomerism
    • B. functional group isomerism
    • C. positional isomerism
    • D. metamerism
    • Discuss
    • 4. The main buffer system of the human blood is

    • Options
    • A. H2CO3 - HCO3
    • B. H2CO3 - CO32-
    • C. CH3COOH - CH3COO-
    • D. NH2CONH2 - NH2CONH+
    • Discuss
    • 5. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

    • Options
    • A. 1 gram of molecule
    • B. 0.5 gram of molecule
    • C. 5 gram of molecule
    • D. 10 gram of molecule
    • Discuss
    • 6. The molecule which has the highest percentage of ionic character among the following is

    • Options
    • A. HI
    • B. HF
    • C. HCI
    • D. HBr
    • Discuss
    • 7. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

    • Options
    • A. granite
    • B. basalt
    • C. igneous rocks
    • D. sedimentary rocks
    • Discuss
    • 8. The metal does not give H2 on treatment with dilute HCL is

    • Options
    • A. Zn
    • B. Fe
    • C. Ag
    • D. Ca
    • Discuss
    • 9. The nuclear particles which are assumed to hold the nucleons together are

    • Options
    • A. electrons
    • B. positrons
    • C. neutrons
    • D. mesons
    • Discuss
    • 10. The iron ore magnetite consists of

    • Options
    • A. Fe2O3
    • B. Fe3OH4
    • C. FeCO3
    • D. 3Fe2O3 .. 3H2O
    • Discuss


    Comments

    There are no comments.

Enter a new Comment