5. Which of the following solutions has a nitrate, NO31, concentration of 0.50 M? a a. 1M LINO3
b. 0.25 M NH4NO3
c. 0.25 M Ca(NO3)2
d. 0.50 M Al(NO3)3

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

one state would change   like louisiana to texas. thats a change

explanation: