13. Which chemical equation below shows a combination (or synthesis) reaction? *
O a) 2KCIO3 ---> 2KCI + 302
b) C+02---> CO2
о
c) 2H20 --> 2H2 + O2
O d) Naci > Na + CI

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

thats how its supposed to be

idk what is it? is this a question that you know the answer or u dont