Question
In: Chemistry
A 3.0% by mass aqueous solution of hydrogen peroxide (H2O2) can be purchased at a pharmacy;...
A 3.0% by mass aqueous solution of hydrogen peroxide (H2O2) can be purchased at a pharmacy; by contrast, chemistry departments can purchase 30.0% by mass aqueous solution of hydrogen peroxide having a density of 1.10 g/mL at 25°C.
How many moles of hydrogen peroxide are supplied by 2.00 g of the 30.0% solution at 25°C?
How many moles of hydrogen peroxide are supplied by 2.00 mL of the 30.0% solution at 25°C.
What mass in grams of water is present in 2.00 mL of the 30.0% solution at 25°C?
How many hydrogen peroxide molecules are present per milliliter of the 30.0% solution at 25°C?
Solutions
Expert Solution
How many moles of hydrogen peroxide are supplied by 2.00 mL
of the 30.0% solution at 25°C.
solution :
mass of solution = v*d
= 2*1.1 = 2.2 g
so that ,
mass of H2O2 in 2.2 g solution = 2.2*30/100 = 0.66 g
no of mol of H2O2 = w/w = 0.66/34 = 0.0194 mole
What mass in grams of water is present in 2.00 mL of the
30.0% solution at 25°C?
solution :
mass of solution = v*d
= 2*1.1 = 2.2 g
so that ,
mass of H2O2 in 2.2 g solution = 2.2*30/100 = 0.66 g
mass of water in solution = 2.2-0.66 = 1.54 g
How many hydrogen peroxide molecules are present per milliliter of the 30.0% solution at 25°C?
solution :
mass of solution = v*d
= 1*1.1 = 1.1 g
so that ,
mass of H2O2 in 1.1 g solution = 1.1*30/100 = 0.33 g
no of mol of H2O2 = 0.33/34 = 0.0097 mole
no of molecules of H2O2 = 0.0097*6.023*10^23
= 5.84*10^21 molecule
queen_honey_blossom answered 1 year agoRelated Solutions
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