Which observation illustrates the law of conservation of mass?
a. burning 10 g of propane produces twice as much carbon dioxide as burning 5 g of propane.
b. the c: o mass ratio of one compound is exactly double that of another compound.
c. when 3 g of carbon reacts with 8 g of oxygen, 11 g of carbon dioxide is produced.
d. the c: o mass ratio of a particular compound is the same, regardless of the size or source of the sample.

i don t now

i think so it’s will be b yes i believe its

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

12 is it do you think so