How many grams of NaN3 are required to produce 283 L of nitrogen gas about the size of an automotive air bag, if the gas has a density of 1.25 g/L? Please answer ASAP

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.

Which best describes how johannes kepler developed his laws of planetary motion

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.