Answer:
Mornin'!
Explanation:
(Actually, it's the afternoon over where I am.)
The six most common elements in living things are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur.
You need a control so you have something to compare the experimental group on-- If you don't have a control group, how will you know what's changed?
<span>From the Born–Landé equation the lattice energy U ∝ (Z+ × Z-) / (r+ + r-) where Z+ and Z- are the charges on the cation and anion, respectively; r+ and r- are radii of the cation and anion, respectively.
The Z+×Z- term dominates. MgO has 2×2 (4) so it will have the higher U than Li2O Z+ × Z- = 2.
You only consider (r+ + r-) term when the Z+×Z- term is the same; smallest the (r+ + r-), the larger is the U.
U(MgO) = 3795 </span>kJ mol^-1
<span>U(Li2O) = 2799 kJ mol^-1
MgO has larger.
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Answer:
D. 108 grams of KNO3(Potassium nitrate)
