7 g of common salt is kept in water in a dish and the dish is heated until all the water evaporates. The weight of salt left in
the dish will be
a 9 g
b 10 g
C 79
d 89
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Find the number of moles of argon in 364g of argon.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

What is the oxidation state of each individual carbon atom in c2o42−?