136 grams of barium sulfate are used to make a 2.5 m solution. how many liters of water are needed?

0.23 L

Explanation: Molarity of solution is defined as the number of moles of solute dissolved per liter of the solution.

Formula used :

where,

n= moles of solute

= volume of solution in L

Now put all the given values in the formula of molarity, we get

Therefore, the volume of solution in Liters is 0.23.

the answer is na (sodium)

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