If 26grams of C3H8 is ignited to a temperature of 350 degrees celsius, then cooled to 75 degrees celsius, how much heat energy will be released if the
specific heat of C3H8 is 1.68 J/g C?*

What element breaks down into yttrium-90?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.