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Give five ways of increasing the rate of the following reaction: H2(g)+Br2(g) -> 2HBr(g)? Help me solve this problem (x^2+4x-21)/2? In a certain experiment 100 grams of ammonia produces 120 grams of urea. Determine the percent yield for thiis reaction.? What is the number of atoms in NaCl? If I am given a graph of F'(x). How can I use this to find the critical values of F(x)?