If 85 g of nh4ci reacts with 130 g of ca(oh)2 according to the following reaction , what is the maximum mass of ammonia that can be formed ? 2 nh4ci + ca(oh)2 caci2 + 2nh3 + h2o

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The answer is falsegravitational force is independent of medium and depends only on the masses of the two objects and the distance between them.

So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.