Which statement describes the structure of an atom? 1)the nucleus contains positively charged electrons. 2)the nucleus contains negatively charged protons. 3)the nucleus has a positive charge and is surrounded by negatively charged electrons 4)the nucleus has a negative charge and is surrounded by positively charged electrons 4)

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

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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