8. Acetic acid, the acid present in vinegar, has the empirical formula of CH20. If the Molar mass of the acid is 60 g/mol, what is its molecular formula? А. 2CH20 B. C2H2O2 C. CH4O D. C2H4O2

12. Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 2.59 2.5 4A1 (s) + 302 (g) - 2A1203 (s) The maximum amount of Al2O3 that can be produced from 2.5 g of Al and 2.5 g of O2 is g. mol

What is the maximum number of grams of nickel bromide that can be produced from the reaction of 67.8 g of nickel with 37.3 g of bromine? b)  Which reactant is in excess and what mass of this reactant is left over? ___Ni     + ___Br2  →  ___NiBr2

2. Consider the reaction: Si + C - Sic a. What is the mole ratio of the reactants? b. If 2 moles of Si were consumed in the reaction, how many moles of SiC were produced? c. What mass of SiC will be produced if 0.500g of Si reacted completely with C?

a. Piperidine, a starting compound for drugs, consists of C, H, and N. Combustion of such compounds yields CO2, H2O, and N2 as products. If the combustion of 9.71 mg of piperidine yields 11.3 mg H2O and 1.60 mg N2, what is its empirical formula? (Enter the elements in the order: C, H, N.) Empirical formula: b. The molecular weight of piperidine is 85.2 amu. What is its molecular formula? (Enter the elements in the order: C, H, N.) Molecular formula:

Balance the equation c.

2. A hydrocarbon was found to be 20% hydrogen by mass. If the molar mass is 30 g/mol, what is the molecular formula? А. СH В. СН C. CH3 D. C,H4 E. C2H. 3. If one mole of ammonium perchlorate is allowed to react with excess aluminum, how many molecules of water will be produced? 3NH,C1O, + 3A1 Al,O, 3NO 6H2O А. 3.61 x 1023 В. 1.00 х 1023 C. 6.02 x 1023 D. 1.20 x 1024 E. 3.01 x 1024 4. A mixture containing 0.40 mol Al in contact with 0.75 mol Cl, is ignited in a closed container. Assum ing complete reaction, which gives the maximum quantity of AICI, produced and quantity of unconsumed reactant? A. 0.40 mol AICI, and 0.15 mol Al unreacted B. 0.40 mol AICI, and 0.15 mol Cl, unreacted C. 0.40 mol AICI, and 0.35 mol Cl, unreacted D. 0.50 mol AICI, and 0.10 mol Alunreacted E. 0.50 mol AICI, and 0.15 mol Cl, unreacted

A. What is the mass of CO2 produced when 15.2 g of O2 reacts with 13.0 g of C7H12? C7H12 (l) + 10 O2 (g)   ---- 7CO2 (g) + 6 H2O(g) ______  g

a. A compound is 54.53% C, 9.15% H, and 36.32% O by mass. What is its empirical formula? b. The molecular mass of a compound is 132 amu. What is its molecular formula?

5. ) 221.89 g/mol 38.00 g/mol 253.8 g/mol 2IF5(s) a 5 F2(g) + I2(s) a. What is the mass (in grams) of fluorine gas that can be produced from 85.00 grams of iodine pentafluoride? b. Calculate the percent yield if a student uses 85.00 grams of iodine pentafluoride, but obtains 23.20 grams of fluorine gas.