You add a solid sample into a liquid in a beaker. after stirring, the solid completely disappears in the liquid and looks clear, like the image below. how would
you classify this type of matter?
a.) heterogeneous mixture
b.) compound
c.) homogeneous mixture
d.) element

Homogenous mixture

Explanation:

Homo means same so the mixture looks the same all around.

Hetero means different and you would be able to see what's in it

Element is a pure substance that can't be broken down into simpler parts.

Compound is a bonded mixture of elements.

the answer is c i believe

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