based on M(s) +2HCl(aq) ----> Mcl2(aq) +h2(g) to what group in the periodic tabl
ID: 1017197 • Letter: B
Question
based on M(s) +2HCl(aq) ----> Mcl2(aq) +h2(g) to what group in the periodic table does the unknown metal probably belong? explain ?
a 40.0 mg sample of a metal reacts with Hcl according to the equation, M(s) +2Hcl(aq)----> MCl(aq) + H2(g). 24.4 mL of gas at 20.0 degrees celcius is collected by the downward displacement of aqueous acid as described in the lab protocol. If the atmospheric pressure is 780 mmHg, what is the atomic weight of the metal?
A student allowed several air bubbles to enter his eudiometer tube. He ignored the error and proceeded with the experiment. What effect will this error have on his final result? explain your rational.
Explanation / Answer
M(s) +2HCl(aq) ----> Mcl2(aq) +h2(g)
in MCl2 metal oxidation sate is +2. it is belong to IIA group element. IIa group element exbits +2 oxidation sate in thier compounds.
M(s) +2Hcl(aq)----> MCl2(aq) + H2(g)
pressure of dry H2 = pressure moisture of H2 -PH2O
= 780-17.5 = 762.5mmHg
P = 762.5mmHg = 762.5/760 = 1atm
V = 24.4ml = 0.0244L
T = 20C = 20+273 = 293K
W = 40mg = 0.04g
PV = nRT
n = W/M
PV = WRT/M
M = WRT/PV
= 0.04*0.0821*293/1*0.0244 = 39.43
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