Solid iron metal reacts with oxygen gas to give iron (III) oxide according to the following unbalanced chemical equation: Fe (s) + O2 (g) ® Fe2O3 (s) If you react 42.88 g of iron with excess O2, how many grams of iron (III) oxide should form? I have balanced the equation and have 4 Fe + 3 O2 ==> 2Fe2O3
I also have calculated the molar mass of iron and oxygen..
Fe= 4 x 55.85 = 223.4 g/mol
O = 6 x 16.00 = 96 g/mol
total = 223.4 +96 = 314.4 g/mol

I then took the initial # provided in the equation and divided it by mass number of Fe (42.88 g/mol / 223.4 g/mol) multiplied by the coefficients 6mol O2 divided by coefficient of 4 mol Fe and finally divided by total molar mass of Fe2O3 319.4 g/mol.
I got a very big number (877.9g/mol Fe2O3) so I feel like I didn't solve it correctly, can someone check for me please?

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1. an experiment in your science class lists the materials needed for the lab. it is your job, as a lab partner, to measure out 25 ml of distilled water and 2.5 grams of magnesium. what lab measuring tools would you choose to measure each substance and how would you use each tool to get the correct amounts? be sure to describe the process you would follow step-by-step. (5 points) 2.which of the following is an si base unit for measuring mass? (2 points) ampere gram meter pound 3.which of the following is an si base unit for time? (2 points) decades hours minutes seconds 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer. 5.a pencil beside a metric ruler. the ruler is scaled from 1 centimeter to 10 centimeters, with markings for millimeters between each number. one end of the pencil is beside the 0 on the ruler, and the pencil point is beside the 5. which of the following measurements is accurate but not precise? (2 points) 5 mm 5 cm 50 mm 50 cm 6. which of the following prefixes represents the largest value? (2 points) giga hector kilo milli 7. which of the following types of graphs is best for plotting the percentages of a whole value in a data set? (2 points) bar graph circle graph histogram line graph