Chemistry Essay

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STOICHIOMETRY 1. What is the SI symbol of mole? A. gram B. mol C. mole D. molecules 2. How many atoms are there in the compound (NH4)3PO4? A. 13 B. 16 C. 20 D. 48 3. What is the mass of 26.0 mol of O? A. 1.625g B. 26g C. 208g D. 416g 4. A mole of H2O contains ________ A. 6.02 x 1023 atoms C. 6.02 x 1023 ions B. 6.02 x 1023 grams D. 6.02 x 1023 molecules 5. What ts the correct unit of a formula weight? A. gram B mol C. gram/mol D. mole/gram 6. How many individual atoms are there in 250 grams of O2? A. 4.70 x 1024 atoms C. 4.70 x 10 -24 atoms B. 4.70 x 1023 atoms D. 4.70 x 10 -25 atoms 7. The mass of one mol is called ________ A. molecule B. molar mass C. percent composition D. percent yield 8. What is the actual number of atoms present in one molecule? A. molecular formula C. percent yield B. percent composition D. Theoretical yield 9. Which of the following is an example of an empirical formula? A. CH2 B. C3H8O C. C5H10 D. K2Cr2O7 10. The molar mass of glucose is ______ (H = 1, C = 12, O = 16) A. 24g B. 53g C. 180g D. 342g 11. When referring to mass sum of the atomic masses of the atoms represented by the formula of a molecular substance, the correct term used is A. atomic mass B. formula weight C. molecular mass D. molecular weight 12. A mole of CO2 contians A. 6.02 x 1023 ions C. 6.02 x 1023 formula ions B. 6.02 x 1023 molecules D. 6.02 x 1023 atoms 13. The mass of the products in a chemical reaction depends on the amount of A. excess reactant B. limiting reactant C. oxidizing agent D. reducing subtannce 14. What is the formula mass of CaCl2? (Ca = 40.1, Cl = 35.45) A. 75.6 amu B. 110.9 amu C. 111.1 amu D. 756 amu 15. What is the formula of the hydrated salt, CuSO4(5H2O? (Cu – 63.5, S=

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