5) How many moles of Aluminum are produced by decomposing molten Al2O3 in 1.05 hours when the current is 100000 A. Use

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5) How many moles of Aluminum are produced by decomposing
molten Al2O3 in 1.05 hours when the current is 100000 A. Use 96500
C / mol as Faraday's constant. Enter the answer without decimals,
round to the nearest whole number.
6) Aluminum and oxygen gas react to produce alumina
according to the equation: 4Al + 3O2 → 2Al2O3 How many moles of
alumina are produced when 300 g of aluminum and 400 g of oxygen
react? Give the answer without decimals, round to the nearest whole
number
7) Chromium consists of four natural isotopes: 83.79 mass
percent 52Cr (atomic mass 51,941 u), 9.50 mass percent 53Cr (atomic
mass 52,941 u), 2.36 mass percent 54Cr (atomic mass 53,939 u) and
4.35 mass percent 50Cr (atomic mass 49,946 u) . What is the atomic
mass of chromium? Enter the answer in the atomic mass unit u. Round
off the answer to two decimal places. Use the decimal point, not
the period.