Chemistry, 18.09.2019 19:20 jennamae9826
What is the half-life of an isotope if after 30 days you have 31.25 g remaining from a 250 g beginning sample size?
a) 5 days
b) 30 days
c) 10 days
d) 2 days
Answers: 2
Chemistry, 22.06.2019 04:30
How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer
Answers: 1
Chemistry, 22.06.2019 13:50
Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.
Answers: 3
What is the half-life of an isotope if after 30 days you have 31.25 g remaining from a 250 g beginni...
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