__mg + __fe2o3 -> __mgo + __fe

balance the chemical equation.

a). 1, 2, 1, 2
b). 1, 1, 3, 1
c). 3, 1, 3, 2
d). 2, 3, 2, 3

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Draw the lewis dot structure for each of the following polyatomic ions

Draw the lewis structure for the trisulfur s3 molecule. be sure to include all resonance structures that satisfy the octet rule.