How do the movents of the sun, Earth, and the moon influence the seasons, phases of the moon, and eclipses?

What is the percent by mass of magnesium sulfate in mgso4.7h2o

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.

What amount in moles does 242 l of carbon dioxide occupy at 1.32 atm and 20 degrees c?