How many grams of pure, solid naoh are required to make 400 ml of 0.1m naoh solution? express your answer to 2 significant figures, e. g. 3.3 g?

neutrons are in the middle of the atom and the electrons, which are much smaller.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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