Mitochondria release energy in a cell. Which type of cells would have the most mitochondria? A:bacteria cell. B:liver cell. C:muscle cell. D:skin cell. E:stomach cell.

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

43.452

step-by-step explanation:

284 times .153 = 43.452