The letter Ne with eight dots. Because it is a Noble Gas, it has eight valence electrons.
OH
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I don't have a calculator with me right now, but that mass would be 1200 grams. Divide the given amount of grams by the molar mass of NH3, which is 17.031g/mol. (Nitrogen + 3(hydrogen)). Again, sorry I didn't have a calculator. But all you would need to do is divide 1200 by 17.031. If you need to use sig figs, your answer should have 2 because the 1.2 x 10^3 limits your amount of sig figs.
Answer:
2HNO3 +Na2CO3 → CO2 + H2O + 2NaNO3
