Answer:
0.4951 grams of Zn have been consumed.
Explanation:
Pressure at which gas is collected over water = p = 732 Torr
Vapor pressure of the water = p' = 26.74 Torr
Pressure of hydrogen gas = P
p = P + p'
P = p - p' = 732 Torr - 26.74 Torr = 705.26Torr
P =
1 atm = 760 Torr
Volume of the hydrogen gas = V = 201 mL = 0.201 L
1 mL= 0.001 L
Moles of hydrogen gas = n
Temperature at which hydrogen gas collected = T = 27°C = 27+273 K = 300 K
Using an ideal gas equation:
n = 0.007573 mol
According to recation , 1 mole of hydrgen gas was obtained from 1 mole of zinc,then 0.007573 moles of hydrgen gas will be obtained from;
of zinc
Mass of 0.007573 moles of zinc:
0.007573 mol × 65.38 g/mol = 0.4951 g
0.4951 grams of Zn have been consumed.