Decide which element probably has a boiling point most and least similar to the boiling point of strontium.

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

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

- decrease the number of plants and animals living in the water.