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?

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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___________?

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

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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?

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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?

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

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

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10. The purpose of Smelting an ore is to________?

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