Tinh kho luchy
2/. 9.10^23 phân tử h2

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Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

3) in peaches, [oh]=3.16x10-11 m a) find [h+ ] b) what is the ph? c) is the solution acidic, basic, or neutral?

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false