I believe that the correct answer would be energy since you need energy for any kind of chemical change to occur. I hope this helped you with your question! If you have any questions please let me know and I might be able to further assist you.
Answer:17
Explanation:NH3 = 14 + 3 = 17 g/mole.
the answer is c.50atm
Explanation:
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First step is to get the number of moles of glycerin in 28 gm:
From the periodic table:
molar mass of carbon = 12
molar mass of oxygen = 16
molar mass of hydrogen = 1
molar mass of glycerin = 3(12) + 8(1) + 3(16) = 92 gm
number of moles = 28/92 = 0.304 moles
Second step is to get the number of moles of water:
mass = 120 ml x 1 gm/ml = 120 gm
molar mass of water = 2(1) + 16 = 18 gm
number of moles = 120/18 = 6.667 moles
Third step is to get the mole fraction of water:
mole fraction of water =
number of water moles / (number of water moles+number of glycerin moles)
mole fraction of water = (6.667) / (6.667+0.304) = 0.956
Last step is to calculate the pressure:
p = vapor pressure of pure water x mole fraction of water
31.8 x 0.956 = 30.4008 torr
Answer: B
Explanation: Valence electrons are the number of electrons out the outermost shell of the diagram. In this diagram, there is one valence electron. This means that it is highly reactive since the shell is not complete and needs other elements to be able to complete the outermost shell. If this model had a full outermost shell, then it would not be reactive (noble gases).