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Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

Cucl2 + 2nano3 cu(no3)2 + 2nacl what is the percent yield of nacl if 31.0 g of cucl2 reacts with excess nano3 to produce 21.2 g of nacl? 49.7% 58.4% 63.6% 78.7%

How many moles of sulfur dioxide are produced when 4.38 moles of oxygen completely react with iron (iv) sulfide