How many atoms of My are present in 72.915 grams of MG? A) 6.022 X 10^23
B) 2.408 X 10^24
C)1.806 X 10^24
D)5.855 X 10^25
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Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

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.

Ablock of aluminum is dropped into a graduated cylinder with an initial volume of water at 75ml and the volumes rises to 90ml. if the block has a mass of 40.5 g what is its density ?