What mass (in g) of nitrogen are needed to react completely with 5.8g of hydrogen? + —>

Explanation:

mass of N2                Mass of3 H2

2x (14) g/mole                     3x(2x1) g/mole

        X        g                           5.8 g

  mass of nitrogen = 27 g

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