A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?

Related Mcqs:

1. Ammonium cynanate was 1st Inorganic compound that was converted into an Organic compound (in Lab) through boiling water. The organic compound was____.

   A. Methane
   B. Ethanol
   C. Acetic acid
   D. Urea

   Submitted by: Aamir khan Hullio

2. Equal masses of methane and oxygen are mixed in empty container at 250?(C) The fraction of total pressure exerted by oxygen is___________________?

   A. one / seventeen
   B. sixteen / seventeen
   C. one / three
   D. two / three

3. If a compound contains 24 gram of carbon 2 gram of hydrogen and 64 gram of oxygen then its empirical formula will be________?

   A. C2H2O4
   B. CH2
   C. CH2O
   D. CHO2

   Submitted by: Raza Samejo

4. The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is___________?

   A. 2.05 gram
   B. 3.05 gram
   C. 4.05 gram
   D. 5.05 gram

   Submitted by: Muhammad Ali Kunbhar

5. How many moles are in 22.2 grams of Calcium chloride, CaCl2?

   A. 0.2 moles
   B. 0.3 moles
   C. 0.4 moles
   D. 0.5 moles

   Submitted by: Muhammad Ali Kunbhar

6. A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?

   A. C2H6O
   B. C6H18O3
   C. C6H12O6
   D. C2H5O

   Submitted by: Muhammad Ali Kunbhar

7. A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?

   A. C2H4
   B. C3H6
   C. C4H8
   D. C5H10

   Submitted by: Muhammad Ali Kunbhar

8. Mass spectrometer is used to determine Mass number of isotopes and___________________?

   A. Atomic number
   B. Relative abundance
   C. Electronic configuration
   D. All of the above

9. What is the mass percent of silver in silver notrate, AgNO3?

   A. 64.5%
   B. 65.6%
   C. 63.5%
   D. 61.5%

   Submitted by: Muhammad Ali Kunbhar

10. The purpose of Smelting an ore is to________?

    A. Reduce it
    B. Oxidize it
    C. Obtain an alloy
    D. Separate volatile impurities

    Submitted by: Muhammad Ali Kunbhar