Moles and Stoichiometry. Regent Review. Correct Answer 0.5 moles. Correct Answer is 6. Correct Answer is (3) C 4 H 8. Correct Answer is (2) 1:2. (4) 310 g/mol is the correct answer. Moles = grams/ molar mass 20 grams/ 85 (g/mol) = .235 moles.
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Moles and Stoichiometry
36 Which formula is both a molecular and an empirical formula?(1) C6H12O6 (3) C3H8O(2) C2H4O2 (4) C4H8
10 The sum of the atomic masses of the atoms in one molecule of C3H6Br2 is called the(1) formula mass(2) isotopic mass(3) percent abundance(4) percent composition
39 Which balanced equation represents a single replacement reaction?(1) Mg + 2AgNO3 → Mg(NO3)2+ 2Ag(2) 2Mg + O2 → 2MgO(3) MgCO3 → MgO + CO2(4) MgCl2+ 2AgNO3 → 2AgCl + Mg(NO3)2
35 Which equation represents a decomposition reaction?(1) CaCO3(s) ==>CaO(s) + CO2(g)(2) Cu(s) + 2AgNO3(aq) ==>2Ag(s) + Cu(NO3)2(aq)(3) 2H2(g) + O2(g) ==>2H2O(l)(4) KOH(aq) + HCl(aq) ==>KCl(aq) + H2O(l)
36 A compound has the empirical formula CH2O and a gram-formula mass of 60. grams per mole. What is the molecular formula of this compound?(1) CH2O (3) C3H8O(2) C2H4O2 (4) C4H8O4
__FeCl2 + __Na2CO3 → __FeCO3 + __NaClWhen the equation is correctly balanced using the smallest whole numbers, the coefficient of NaCl is
What is the percent by mass of oxygen in Fe2O3
(formula mass = 160)?
What is the correct formula for chromium (III) oxide?
A hydrated salt is a solid that includes water molecules within its crystal structure. A student heated a 9.10-gram sample of a hydrated salt to a constant mass of 5.41 grams. What percent by mass of water did the salt contain?
Which pair of formulas correctly represents a molecular formula and its corresponding empirical formula?