B_2 H_6 B_4 H_10 B_5 H_9 B_6 H_10 B_10 H_14 Acetaldehyde is a common liquid comp
ID: 1010316 • Letter: B
Question
B_2 H_6 B_4 H_10 B_5 H_9 B_6 H_10 B_10 H_14 Acetaldehyde is a common liquid compound that vaporizes readily. Determine the molar mass of acetaldehyde from the following data: Sample mass = 0.107 g Volume of gas = 125 mL Temperature = 0.0 degree C Pressure = 331 mm Hg Iron reacts with hydrochloric acid to produce iron(II) chloride and hydrogen gas: Fe(s) + 2 HCl(aq) rightarrow FeCl_2 (aq) + H_2(g) The H_2 gas from the reaction of 2.2 g of iron with excess acid is collected in a 10.0-L flask at 25 degree C. What is the pressure of the H_2 gas in this flask?Explanation / Answer
Fe + 2HCl ------> FeCl2 + H2
1 mole of Fe react with HCl to gives 1 mole of H2
56g of Fe react with HCl to gives 2g of H2
2.2 g of Fe react with HCl to gives = 2*2.2/56 = 0.0785g of H2
PV = nRT
n = W/M
PV = WRT/M
W = 0.0785g
M = 2
R = 0.0821L-atm/mole-K
T = 25C0 = 25+273= 298K
V = 10L
P = WRT/VM
= 0.0785*0.0821*298/10*2 = 0.096atm >>>> answer
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