CaCl2(aq) + 2Na3(PO4)(aq) → Ca3(PO4)2(s)+ 6NaCl(aq) Use the balanced equation and the Molar Mass table above to answer the following question. Suppose 163.9 g of Na3(PO4) in solution mixed with sufficient CaCl2 in solution yields 116 g ofCa3(PO4)2(s). What is the percent yield of Ca3(PO4)2(s)?

Nitric oxide (no) can be formed from nitrogen, hydrogen and oxygen in two steps. in the first step, nitrogen and hydrogen react to form ammonia: n2(g) + 2 h_2(g) rightarrow 2 nh_3 (g) delta h = -92. kj in the second step, ammonia and oxygen react to form nitric oxide and water: 4 nh_3(g) + 5 o_2(g) rightarrow 4no(g) + 6 h_2o(g) delta h = -905. kj calculate the net change in enthalpy for the formation of one mole of nitric oxide from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

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Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail