Hỗn hợp khí X gồm O2 và O3 có tỉ khối so với H2 là 23. Hỗn hợp Y gồm CH4 và C2H2 có tỉ khối so với H2 là 11. Để đốt cháy hoàn toàn V1 lít khí Y cần vừa đủ V2 lít khí X (biết sản phẩm cháy gồm CO2 và H2O các chất khí đó ở cùng đktc, nhiệt đọ, áp suất). Tỉ lệ V1:V2 là bao nhiêu?

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

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

a chemical change results in a new substance being formed; whereas a physical change will result in a different state of matter

explanation: