Manganese dioxide reacts with aluminum to form aluminum oxide and manganese according to the equation below.
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Ответ:
The answer is -1839.5 kJ/mol. This was calculated using the given formula for ΔH. You have to calculate the sum of ΔHf for products and subtract from it the ΔHf of the reactants.
ΔHrxn = (2 mol *-1699.8 kJ/mol) - (3 mol * -520 kJ/mol) where 2 mol Al2O3 and 3 mol MnO2 came from the given reaction. The other reactant and products are in their standard form so their ΔHf is zero.
Ответ:
The diagonal is 39.54 in
Step-by-step explanation:
First we use the Pythagorean theorem to calculate the length of the diagonal of the base.
If the base measures 13 inches by 35 inches then the diagonal is:
Now we use the Pythagorean theorem again to find the diagonal of the cube.
If the height of the box is 13 inches and the diagonal of the base is 37.34 inches then the diagonal of the cube will be
The baton will fit in the box if it is placed in the direction of the diagonal of the cube, since:
39.54\ in > 38 inches