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I NEED HELP ASAP!!! Find the mass of each substance. Show your work.

A. 7.00 mil H202
B. 5.60 mol NaOH

1 Answer

6 votes

Answer:

A: 238 g

B: 224 g

Step-by-step 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

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