Chemistry, 01.12.2021 17:40 vickydaiberg
polonium-218 has a half-life of 3.0 minutes. a sample weighing 50.0g is stored on a laboratory shelf. How much of the isotope will remain after 15 minutes.
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Chemistry, 22.06.2019 06:00
Why is permeable soil best for plants that need a lot of drainage?
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Chemistry, 23.06.2019 06:40
The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants.thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction.ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch,are burned? b) how much energy is released when 22.4g of ch. areburned?
Answers: 1
polonium-218 has a half-life of 3.0 minutes. a sample weighing 50.0g is stored on a laboratory shelf...
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