2. Sulfuric acid is produced by oxidization of sulfur dioxide with oxygen to sul

Question

2. Sulfuric acid is produced by oxidization of sulfur dioxide with oxygen to sulfur trioxide, and the sulfur trioxide is dissolved in water: If 640.7 Ilb-mass ofsufur dixide are oxidized per hour, mow many pound-moles of Or are consumed in an 8 hour shift? (20 points) b-mole 2 in per hour 3. A compound X contains 63.3% manganese and 36.7%)oxygen by mass. When X is heated, oxygen gas is evolved and a new compound Y containing 72.0% manganese and 28.0% oxygen is formed. Determine the empirical formulas of X and Y. (20 points)

Explanation / Answer

Q3

X = 63.3% Mn, 36.7% is O

Y = 72% Mn, 28% O

determine empirical formulas

assume a basis of 100 g so

for X

mass of Mn = 63.3

mass of O = 36.7 g

now, change to moles

mol of Mn = mass/MW = 63.3/54.9380450 = 1.1522

mol of O = mass/MW = 36.7/16 = 2.29

ratio

O/Mn = 2.29/1.1522 = 1.99

then

MnO2

for Y:

mass of Mn = 72

mass of O = 28 g

now, change to moles

mol of Mn = mass/MW = 72/54.9380450 = 1.31

mol of O = mass/MW = 28/16 = 1.75

ratio

O/Mn = 1.75/1.31 = 1.33 = 4/3

so

Mn3O4

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