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mojhsa [17]
3 years ago
10

How do you find half life like i know the formula with 1/2 but how do you know how many times you do it

Chemistry
2 answers:
maksim [4K]3 years ago
3 0
Can you give the specific problem?
poizon [28]3 years ago
3 0
Only one time.....................
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Solid chromium (III) reacts with oxygen gas to form solid Cr2O3. What is this type of reaction?
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Answer:

.081 g of O2

Explanation:

4Cr + 3O2 -----> 2Cr2O3

.175 g Cr x [1 mole / 52.0 g] x [2 moles Cr2O3 / 4 moles Cr] x [152 g / 1 mole] = .256 g of Cr2O3

.175 g Cr x [1 mole / 52.0 g] x [3 moles O2 / 4 moles Cr] x [32 g / 1 mole] = .081 g of O2

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