50 ! classify the chemical equations as being balanced or not balanced. 2co + 2no → 2co2 + n26co2 + 6h2o → c6h12o6 + o2h2co3 → h2o + co22cu + o2 → cuo

A chemical equation can be defined as balanced chemical equation if the number of atoms and the total charge is same on both sides of the reaction i.e reactants and products have same number of atoms.

Whereas, imbalanced reaction does not have same number of atoms and charge on reactants and products.

A. 2CO + 2NO → 2CO2 + N2

is a balanced equation as the number of carbon, oxygen, and nitrogen atoms are same on both sides.

B. 6CO2 + 6H2O → C6H12O6 + O2

is an imbalanced equation as oxygen atoms are not balanced here.

C. H2CO3 → H2O + CO2  is a balanced equation as same number of hydrogen, carbon, and oxygen are present on both sides.

D. 2Cu + O2 → CuO is an imbalanced equation as both copper and oxygen are imbalanced here.

what is the question here. i think you messed up.

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