- What is the parent base of nac2h3o2 ?

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How does a black widow spider fit into the cladogram of invertebrates? If 990. mL of water is added to 10.0 mL of 0.10 M HCl, what is the pH of the resultant solution? In what way will the calculated molar mass be affected if the precipitate is not heated to constant mass. **Please help 5 stars Chemistry***? How do I find the value of cos B from: tan B/2, given tan B = -sqrt(11)/5, with pi/2 < B < pi The answer is -5/6, but how do they get it? Is the Law of Attraction pseudo science?
Its based on quantum physics which is far from pseudo science. If it is, why?