Ineed ! find the mass of each substance. show your work.
a. 7.00 mil h202
b. 5.60 mol naoh

A: 238 g

B: 224 g

Explanation:

Data given:

A.

number of moles of H₂O₂ = 7.00 mole

mass of H₂O₂ = ?

B.

number of moles of NaOH = 5.60 mole

mass of NaOH = ?

Solution:

Part A:

Formula will be used

               no. of moles = mass in grams / molar mass

As we have to calculate mass of substance

So, rearrange the above equation

             mass in grams =  no. of moles x molar mass . . . . . . (1)

Molar Mass of H₂O₂ = 2(1) + 2(16)

Molar Mass of H₂O₂ = 2 + 32

Molar Mass of H₂O₂ = 34 g/mol

Put values in equation 1

                 mass in grams = 7.00 mol x 34 g/mol

                 mass in grams =  238 g

mass of H₂O₂ = 238 g

Part B:

Formula will be used

               no. of moles = mass in grams / molar mass

As we have to calculate mass of substance

So, rearrange the above equation

             mass in grams =  no. of moles x molar mass . . . . . . (1)

Molar Mass of NaOH = 23 + 16 + 1

Molar Mass of NaOH  = 40 g/mol

Put values in equation 1

                 mass in grams = 5.60 mol x 40 g/mol

                 mass in grams =  224 g

mass of NaOH = 224 g

93.2 ml + 3920 ml = 4013 ml total  

(93.2 ml) * (2.03 m) / (4013 ml) = 0.0471 m

the volume in in l of the diluted solution would be 0.0471 m.

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