Questions asked
Lijeesh Krishnan
Numerade educator
A heterogenous mixture of gas is cooled from 293.15 K to 273.15 K resulting in a volume change from 255 mL to 200 mL. What would the final pressure be if the initial pressure was 0.26 atm?
Nicholas Mogoi
Your experiment requires 3 moles of KHCO3. How many grams of KHCO3 do you need?
Chareen Guzman
Nitrogen gas is being held in a container at 0.0 °C. If the pressure of nitrogen was initially 0.4 atm, what would the pressure be after its temperature changed to 105 °C?
David Collins
It takes 27.5 hours for a 25-gram sample of element X to decay to a final amount of 5 grams. What is the half-life of element X in days?
Sima Sarker
How long will it take for a 25-gram sample of lead-212 to decay to 15% of the initial mass? Lead-212 has a half-life of 10.6 hours.
Plutonium-239 has a half-life of 24,120 years. Assuming we started with 20 grams, how much plutonium would there still be after 30 years
Ronald Prasad
Assuming uranium-238 has a half-life of 4.47 x 109 years, how long will it take for 5 grams of depleted uranium to be depleted by 1/8 of its original mass?
If the half-life of I-131 is 8 days, how long would it take before the radiation is considered eliminated?
A heterogenous mixture of gas is decompressed from 0.25 atm to 0.12 atm resulting in a volume change from 125 L to 62.0 L. What would the final temperature be if the initial temperature was 298.15 K
Jennifer Hudspeth
How many moles of sodium chloride should be dissolved in 4 L of water to produce a 0.5 M solution