Chemistry, 18.03.2021 01:00 dowlingdestiny
6. A 50-year-old sample of Strontium-90 is found. The half-life of strontium is 29 years. If the sample is currently 95.3 g; what was the original mass of the sample?
Answers: 3
Chemistry, 22.06.2019 10:50
8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm
Answers: 1
Chemistry, 22.06.2019 13:30
1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6
Answers: 2
6. A 50-year-old sample of Strontium-90 is found. The half-life of strontium is 29
years. If the sa...
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