Question

Name: - THE MOLEW! Session: _ T.A. - Directions: Write in the parenthes ) D. 3.0 x 10" E 1.20 x 1022 ) - g/mol E. 88.07 ) 4. 2.4x1024 0 ) E. 0.6949 - on the parenthesis the letter that indicates the correct answer. 1. The number of carbon atoms in 2.0 moles cis A. 6.0. B. 12 . C. 6.0 x 101 D. 3.0 x 1023 E . 1.20 x 10 2. The molar mass of potassium phosphate (KPO) is A. 173.17 B. 251.37 C. 212.27 D. 196.27 E. 88.07 3. The number of molecules in 0.25 mole NHz is - A. 0.25 B. 2.5 x 10 C. 4.2x 104 D. 1.5 x 1023 E 2.4 x 102 4. The molar mass of potassium is A. 159 C. 6.02 x 1029 D. 89.19 5. One mole of helium gas weighs A. 8.00g -B. 1.009 C. 4.009 D. 3.009 E. 2.00g 6. 0.100 mole of lithium weighs A. 6.949. B. 0.300g C. 3.00g D. 0.700g 7. What is the molar mass of copper (II) sulfate, CuSO.? A. 159.69 B . 16.09 C. 63.89 D. 111.69 E. 319.29 8. 4.00 moles of sodium have a mass of A. 92.0g. B. 4.60g C. 44.0g D. 11.09 .23.09 9. How many moles of K SO. are in 15.0 g of K SO? A. 0.119 moles B. 0.172 moles C. 0.111 molos D. 2.61x102 E. 0.0861moles 10.3.00 moles of NO, have a mass of A. 30.0g B. 138g C. 90.09 . D. 45g 11. How many grams of Fe2O3 are there in 0.5000 mole of Fe2O,? A. 160g B. 51.99 E. 79.89 12. How many grams of glucose (CH 120c) are in 3.55 moles of glucose? . B. 180g A. 426g C. 6399 D. 1039 E. 50.7g 13. The number of grams in 0.350 mol of Nais C 0.350 11.0 B. D. 65.7 E A. 23.0 8.05 14. A student weighed 0.550.90 olohed 0.550 g of lithium chloride (LICI) to use in a reaction. How many moles in this? Hint: Convert 0.550g Lici to mole LICI B. 42.39 C . 0.0130 D. 5.11 E. 23.31 A. 77.08 _mol Cly. 15.50.0 9 of Clz contains 1 C. 1775 C. . 1.41 1775 D. 424 x 1023 D . 4.24 x 1023 A. E. 50.0 0.704 B CoC - E. 46.0g mole of Fe2O3.83.89

Answer 1

Here are some ma%% formula- of aton numer of atoms number of molest & NA number of molecules a number of moles of molecules XNA molar mass number of molex Molar molecule sum of product that t the atoms molar masses the of molecule and their multiplicity. 23 Avogadro's number - 6.022 XIO the mass 1 number of carbon atoms a 200 2.0x 6.022 x 1023 1.20x 1024 atoms - molar mass of tk po4 ) = 3x mоn mаkѕ ok + molar ma88 of P +4x molar mass of o 3x39.10+ 30.97+4X16.00 212.27 g/mol numer of molecules -0.256.022X10 1.581023 23 molecules 23 The molar ma88 of potassium is (Periodic table) 39.1g.

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