Chem 104-001 Assignment Two Name Student # 1) Determine the products for the fol

Question

Chem 104-001 Assignment Two Name Student # 1) Determine the products for the following reactions. (5) a. Mg(C103)2 b, K+02 2) Using the periodic table handed out day one to determine the formula weight for the following compounds (use significant figure rules). (4) a. Fe203 b. Pba(P04)2 c. Sn(C2Hs02) d. Cr(CN) amu amu amu amu Use dimensional analysis to solve all stoichiometric calculations. Round answers to the correct # of significant figures. 3) How many grams are contained in 3.57 x 10a molecules of PCis? (3) 4) Determine the number of moles in 45.26 grams of CaHs (propane)? (2) 5) How many molecules are present in propane sample? (2) 6) What is the total number of atoms in this sample of propane? (2)

Explanation / Answer

1.

(a)

Mg(ClO3)2 ---------------> MgCl2 + 3 O2

(b)

4 K + O2 ---------------> 2 K2O

(OR)

K + O2 --------------> KO2

(c)

2 LiOH ------------> Li2O + H2O

2.

(a)

Formula weight of Fe2O3 = 2 (at. wt. of Fe) + 3 ( at. wt. of O) = 2 (56) + 3 (16) = 160 amu

(b)

Fromula weight of Pb3(PO4)2 = 3 (at. wt. of Pb) + 2 (at. wt. of P) + 8 (at. wt. of O) = 3 (207)+2(31)+8(16) = 811 amu

(c)

Formula weight of Sn(C2H3O2)4 = 1 (at. wt. of Sn) + 8 (a. wt. of C) + 12 (at. wt. of H) + 8 (at. wt. of O)

= 1 ( 118.71) + 2 ( 12 ) + 12 ( 1 ) + 8 ( 16 )

= 282.71 amu

(d)

Formula weight of Cr(CN)3 = 1 (at. wt. of Cr) + 3 (at. wt. of C) + 3 ( at. wt. of N) = 1 (52) + 3 (12) + 3 (14) = 130 amu

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