What is the molarity of a solution that contains 0.202 mol kcl in 7.98 l solution?

Explanation:

1) Data:

a) M = ?

b) Solute: KCl

c) n = 0.202 mol

d) V = 7.98 liter

2) Principles and formulae:

a) Molarity is the number of moles of solute per liter of solution. The units of molarity are mol/liter, which is equivalent to M.

b) M = n / V (in liter)

3) Solution:

Substitute the data into the equation M = n / V (in liter)

Since the number of moles and the volume are expressed with 3 significant figures, the answer is given with the same number of significant digits.

they are all solids.

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