Helpo pls rnn only have 5 min The percent
composition of an
unknown substance is
75.42 % Carbon, 6.63
% Hydrogen, 8.38 %
Nitrogen, and 9.57 %
Oxygen. If its molar
mass is 668.0 g/mole
what is its molecular
formula?

mass of the empirical formula is 259.64 g/mol. = 519 g/mol

Explanation:

The molecular formula is Hg2C4H6O4. One of the most deadly poisons, strychnine, has a formula weight of 334 g/mol and the composition 75.42% C, 6.63% H, 8.38% N; the rest is oxygen.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.