At what approximate temperature and pressure can all three phases of water exist simultaneously? a. 0°c, 760 mmhg b. 0°c, 5 mmhg c. 80°c, 380 mmhg d. 100°c, 760 mmhg

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

it should be all of them because it asks if you included all of those in your answer

explanation: