The symbol for the element in period 2, group 13

What does the mass of 0.7891 mol of ferric oxide (fe2o3)

What shape would a molecule with two bound groups and two lone pairs have?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.