Which unit do we use to measure Power?

Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done. The SI unit for power is the watt. The watt (W) is the SI derived unit for power. It comes from the SI base units. Power is the measure of how much energy or work is used per unit time.

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