For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)?You do not need to look up any values to answer this question. Check all that apply. View Available Hint(s) Check all that apply. CO(g)+12O2(g)→CO2(g) Li(s)+12F2(l)→LiF(s) C(s)+O2(g)→CO2(g) CaCO3(g)→CaO+CO2(g) 2Li(s)+F2(g)→2LiF(s) Li(s)+12F2(g)→LiF(

What does the process of natural selection involve

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0