A) One compound is isolated which contains only nitrogen, hydrogen, and chlorine. When a 1.376-gram sample of this compound is completely combusted, 0.478 g
of H20 and 0.372 g of N2 are recovered. Determine the empirical formula of this
compound

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.