Consider the galvanic cell, Zn(s) | Zn2+(aq) || Pb2+(aq) | Pb(s). Which one of the following changes to the cell would cause the cell potential to increase (i. e., become more positive)? a. increase the zn2+.
b. increase the Pb2+.
c. increase the mass of Zn.
d. decrease the mass of Zn.

2b2t

explanation:

2b2t

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2

lab safety rules

explanation: