How many moles of Na20 are required to produce 160 grams of NaOH (40.00 g/mol)?

What’s the scientific notation for the number 6,840,000,000

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Particles vibrate in a rigid structure and do not move relative to their neighbors.