2232 2571 15. 3900 mi of 0.590 Morph torrat Sooc and water at 500C with react ex

Question

2232 2571 15. 3900 mi of 0.590 Morph torrat Sooc and water at 500C with react excess amount R a with of The bydrogenc produced mol total pressure kPa Fisd the vol of hydropen 760 lume 16:50.00 g of a diprotic acid with an eement from third group to produce sale and lydroges gas suppose Boe was collected over water at 60 0 Cand 10800 kPa Find the molarity and the molar mass of the acid. Given 1 atm 760 terv a 101.325 x As 19608g/ mol and 6.17 mol/L B 8389 g/mol and 250 C225.79 g/mol and s41 moln D 182.60 g/mol and 663 molVL E: none of the above 17: calculate the lattice energy of Potassium Fluorkde. 4 419 kl 58 AE 712 Sta. Heat of Formation A: 820 kl/mol B: 841 kl/mol C: 1513 kl/mol 801 E: none of these choices is correct 18: Calculate the molality of the following solution A: 0.942 m B 0.312 m 5.77 m 24 m

Explanation / Answer

Q15

V = 39 mL; M = 0.59 M of H3PO4, excess Zinc, to produce salt + H2gas

T = 50C, 323K

P = 99.99 kPa = 0.9868 atm = 749.968 torr

Find volume of Hgas

Pvapor = 92.5 torr

Pgas = Ptotal -Pvapor = 749.968 - 92.5 = 657.468 torr

PV = nRT

Mol formed:

2H3PO4 + 3Zn = Zn3(PO4)2 + 3H2

mol of acid = MV = 39*0.59 = 23.01 mmol = 23.01*10^-3 mol of acid

ratio is 2:3 so

23.01*1.5 = 34.515 mmol of H2 gas = 34.515*10^-3 mol of gas

V = nRT/P

V = (34.515*10^-3)(62.4*323)/(657.468) = 1.0580845425 liters

choose 1.0'6 L

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