Magnesium reacts with iodine gas at high temperatures to form magnesium iodide.
ID: 496301 • Letter: M
Question
Magnesium reacts with iodine gas at high temperatures to form magnesium iodide. What mass of Mgl_2 can be produced from the reaction of 5.15 g Mg and 50.0 g I_2? a. 29.5 g b. 44.9 g c. 54.8 g d. 55.2 g e. 58.9 g Aspirin (C_9H_8O_4) is produced by the reaction of salicylic acid (M = 138. g/mol) and acetic anhydride (M = 102.1 g/mol) C_7H_6O_3(s) + C_4H_6O_3(l) rightarrow C_9H_8O_4(s) + C_2H_4O_2(l) If you react 2.00 g C_7 H_6O_3 with 1.60 g C_4H_6O_3 what mass of aspirin (M = 180.2 g/mol) can theoretically be obtained? a. 0.40 g b. 2.61 g c. 2.82 g d.1.53 g e. 3.60 g If 0.1800 g of impare soda ash (Na_2CO_3) is titrated with 15.66 mL of 0.1082 M HCl, what is the percent purity of the soda ash? Na_2CO_3(aq) + 2 HCl(aq) rightarrow 2 NaCl(aq) + H_2O(l) + CO_2(g) a. 17.96% b. 49.89% c. 50.11% d. 94.13% e. 99.77% The complete combustion of 0.26 moles of propane, C_3H_8, will a. consume 0.26 mol O_2 and produce 0.26 mol CO_2 b. consume 0.26 mol O_2 and produce 0.52 mol CO_2 c. consume 1.3 mol O_2 and produce 0.78 mol CO_2 d. consume 1.3 mol O_2 and produce 3.9 mol CO_2 e. consume 1.3 mol O_2 and produce 1.0 mol CO_2 The empirical formula of butadiene is C_2H_3. An experimental determination of the molar mass of butadiene yields the value of 54 g/mol. What is the molecular formula of butadiene? a. C_5H_10 b. C_4H_6 d. C_3H_8 c. C_6H_9Explanation / Answer
27)
Mg(s) + I2(g) ------------- MgI2(s)
5.15/24 50/127
0.214mol 0.393mol 0.214mol
It is 1:1 reaction. That is from the above balanced equation it is clear that 1 mole of Mg reacts with 1 mole of iodine to form 1 mol of MgI2.
First find out the number of moles of each reactant. Mg (0.214 mol) and Iodine (0.393 mol).
Since Iodine is in excess quantity magnesium is the limiting reagent. So 0.214mol of MgI2 is formed in the above reaction.
Mass of MgI2 formed is = 0.214*278.1= 59.51g
28)
C7H6O3(s) + C4H6O3(l) ---------- C9H8O4(s) + C2H4O2(l)
Wt = 2g 1.6g ??
M = 138g/mol 102g/mol 180.2g/mol
No of mol= 0.0145 0.0157
This is balanced equation and its 1:1 reaction. Here C7H6O3(s) is limiting reagent. Hence 0.0145mol of C9H8O4(s) is formed.
Mass of aspirin formed is 0.0145 * 180.2 = 2.61g
or
Theoretical mass of aspirin can be calculated as follows
138g/mol of C7H6O3(s) gives 180.2g/mol of C9H8O4(s)
2g of C7H6O3(s) gives ???
Theoretical mass of aspirin = 2*180.2 / 138 = 2.61g
29)
Na2CO3(aq) + 2HCl(aq) --------------- NaCl(aq) + H2O(aq) + CO2(aq)
0.0018 mol 0.0016 mol
The molarity of HCl is 0.1082M from 15.66 ml.
The number of moles of HCl present is = M* V (in L) = 0.1082M x 0.01566L = 0.0016 mol.
The number of moles of soda ash (M=100g/mol) = 0.18/100 = 0.0018 mol.
Left over soda ash is 0.001 mole.
Percentage purity of soda ash is (0.0008/0.0018)*100 = 44.4%
30)
C3H8 (g) + 5O2(g) ---------------- 3CO2(g) + 4H2O(l)
1 mol 5 mol 3 mol
0.26 mol 1.3 mol 0.78 mol
Write the equation for the combustion of propane and balance the equation. From the balanced equation its is clear that 1 mole of propane requires 5 mole of oxygen for the complete combustion and it produces 3 mole of carbondioxide.
Hence 0.26 mole of propane required 1.3 mole of oxygen for complete combustion and produces 0.78 mole of carbon dioxide.
31)
Experimentally determined molar mass 54g/mol.
Molecular formula of butadiene is C2H3 (Molar mass is 27)
54/27 = 2
So multiple the molecular formula by 2. That is molecular formula would be C4H6
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