ASAP WILL GIVE BRAINLIEST!
1. A 1.68 g sample of iron reacts with 0.72 g oxygen to form rust, Fe2O3, iron (III) oxide. What is the per cent composition (% m/m) of the elements in the rust?
2. If a solution of Na2SO4 in water weighs 220 g and contains 35 grams of Na2SO4, what is the per cent composition (% m/m) of the Na2SO4 in the solution?
3. A solution is made by combining 25 mL of ethanol (C2H6O) with water to produce 255 mL of solution. Determine the per cent composition (% v/v) of ethanol in this solution.
4. A solution is prepared by dissolving 96 mL of hydrogen peroxide (H2O2) in enough water to make 2800 mL of solution. Determine the per cent composition (% v/v) of hydrogen peroxide in this solution.
5. What is the molarity of a solution made of water added to 45 g AgNO3 to produce 650 mL of solution?

What is the volume occupied by 10.0 dm3 of gas at standard pressure after it has been compressedat constant temputure to 500.0 kpa?

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Since the gas in your graduated cylinder is a mixture of butane and water vapor, you must determine the partial pressure of the butane, pbutane, alone. to do this, consult a reference and record the partial pressure of the water vapor, pwater, at the temperature you recorded. use the following formula to compute the partial pressure of the butane. pbutane = atmosphere - pwater use the following combined gas law formula and compute the volume that the butane sample will occupy at stp. (hint: convert both temperatures to kelvin.) pbutane x voriginal = pstandard x vfinal troom tstandard use the following ratio and proportion formula to determine the mass of butane needed to occupy a volume of 22.4 l at stp. grams of butane you used “x” grams of butane ml of butane corrected to stp = 22,400 ml compute the theoretical molar mass of butane based on its formula and the atomic masses on the periodic table. compare your experimental results from #3 to the theoretical value of #4, computing a percent error of your findings using this formula: % error = measured value - accepted value x 100 accepted value use the following ratio and proportion formula to determine the mass of butane needed to occupy a volume of 22.4 l at stp. need asap