Calculate the number of kilojoules to warm 125 g of iron from 23.5 °c to 78.0 °c.

The molar mass of iron is 55.8 grams.
number of moles of iron = 125 g/(55.8 g/mol) = 2.24 moles    

q = nrt
q=  2.24 moles (8.314 joules per mol degrees celsius) (78.0 degrees celsius – 23.5 degrees celsius) 
q = 1014.97 joules or 1.015 kilojoules

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom