How does a hydronium ion molecule form?
a) evaporation.
b) two water molecules bonded.
c) a water molecule gained an hydrogen ion from another water molecule.
d) a hydrogen molecule bonded with an oh- molecule.
e) a water molecule split in half

C

Explanation:

Attached is the structure of a hydronium ion.

A is not the answer since evaporation is a phase change, not a structural change.  We are looking for a structural change since we are trying to form a hydronium ion.

B is not the answer since two water molecules bonded together would not produce the attached structure. It would produce a structure with two oxygens and four hydrogens.

C is the answer since water bonding to another hydrogen produces a hydronium ion.

D is not the answer since this combination would produce water.

E is not that answer since splitting a water molecule in half would take from the structure when you are actually supposed to add to it.

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