Determine the molar concentration of ammonium ions, NH4 , in a solution that results when 4.53 g of (NH4)2SO4 are dissolved in 100 mL of water.

Molar concentration of solution is 0.343 M

Explanation:

Molar mass of is 132.14 g/mol

So, 4.53 g of = of = 0.0343 mol of

Molar concentration means how many moles of solute are present in 1000 mL of solution

Here solute is

Let's assume total volume of solution is equal to volume of water as solids have negligible volume with respect to liquid

So, molar concentration of solution =

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