What is the number of molecules in 500cm? of oxygen under room conditions? 22
a. 1.25 x 10 22
b. 1.34 x 10
c. 3.0 x 10 22
d. 3.0 x 10 26

the answers would be

the first one and the second one

can you attach the

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

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