Calculate the enthalpy of reaction (AHrxn) for the following reaction: Fe2O3(s) + 3 CO(g) - 2 Fe(s) + 3 CO2(g) Given: 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) AH = -1648 kJ 2 CO2(g) → 2 CO(g) + O2(g) AH = +565.4 kJ​

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

56.16 gregor mendel was the first scientist to use statistics to analyze scientific data. before mendel's experiments, scientists believed that organisms acquired traits from their environment and passed them on to their offspring. after mendel's discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from parents to offspring. this is an example of pls