How can one determine that solid sulphur is pure?

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

Rank substituents in order of their priority when assigning the e or z label to an alkene. i, ch2i , h, ch2ch2cl, f

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1