200.00 grams of an organic compound is known to contain 83.884 grams of carbon, 10.486
grams of hydrogen, 18.640 grams of oxygen and the rest is nitrogen. what is the
empirical formula of the compound?

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?