Question

1. Vanadium and oxygen react to make vanadium (V) oxide. How many grams of vanadium and oxygen are needed to make 85 g of vanadium (V) oxide? Ans. 48 g of vanadium and 37 g of oxygen 2. Iron(III) oxide can be converted to iron metal and water by heating it with hydrogen gas. If 100. g of iron(III)oxide is reacted with 2.00 g of hydrogen gas, how much iron metal will be formed? Ans. 36.9 g Fe 3. How many grams of precipitate are formed when an aqueous solution containing 75 g of cobalt(II) chloride is mixed with a solution containing 65 g of potassium phosphide? Ans. 468 of precipitate 4. A compound containing C, H, and O is 30.0% C and 10.1% H by mass. If the compound has a molar mass of 240 g/mol, what is its molecular formula? Ans. C.H2409 5. When 3.3 g of C Hlo is combined with 0.50 mL of liquid bromine, 3.5 g of C HioBrs is isolated. What is the percent yield for this reaction? The density of liquid bromine is 13.1 g/mL. Ans. 45% yield CH10(0) + 3 Br2 () - CH10Br6 6. A small piece of zinc is dissolved in an aqueous solution that contains 1.92 g of HCI Zn(s) + HCl(aq) - ZnCl2(aq) + H2(g) (unbalanced) At the conclusion of the reaction, all of the zinc has dissolved and 1.42 g of HCl is left over. What must have been the mass of the piece of zinc dissolved? Ans. 0.45 g Zn

Answer 1

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