mass

Limestone(CaCO3) is used to remove acidic pollutants from smokestack flue gases in a sequence of decomposition-combination reactions. The limestone is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite. Assuming a 74.7% yield in the overall reaction, what mass of limestone is required to remove a ...continues

Naming compounds, mass percent, reaction, density

The attached is what I need step by step answers and solutions to. 1) Name the following compounds (or write the molecular formula) and indicate whether they are ionic or covalent: NOTE: Please, please go through the steps for each one on how you get the answer. Now, I know you are supposed to first determine if ...continues

reaction

Please give step by step solutions and answers made simple to grasp please. 1)Write the balanced molecular equation for the reaction of calcium with molecular oxygen to form calcium oxide. 2) You start out with an empty crucible weighing 19.3350g. After adding some calcium to the crucible, the mass is now 22.1156g. A ...continues

Calculating the number of molecules present in a sample

I can't seem the get the one problem correct. I need the calculate the number of molecules present in: (a) 0.650 mol propane, C3H8, a gas used in laboratories (b) a 500mg tablet of CaCO3, an antacid

Determining the mass of a substance

I keep coming up with .05grams. Apparently the wrong answer. The question is: What mass of oxgen gas will occupy 450.mL at 145mmHg and 62.5 degrees Celcius? I am also having trouble with finging the volume in liters of 52.0g of CO2 at 410mmHg and 99.0 degrees Celcius. I have used the n=PV/RT formula for the mass and V=PnRT for ...continues

heat of combustion

A chemical engineer studying the properties of fuels placed 1.950 g of a hydrocarbon in the bomb of a calorimeter and filled it with O2 gas. The bomb was immersed in 2.643 L water and the reaction initiated. The water temperature rose from 19.46°C to 27.39°C. If the calorimeter (excluding the water) had a heat capacity of 465 ...continues

temperature chage

High-purity benzoic acid (C6H5COOH; DHcomb = -3227 kJ/mol) is a combustion standard for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity = 1365 J/°C) that contains exactly 1.200 kg water. What temperature change is observed?

work of expansion

One mole of nitrogen gas confined within a cylinder by a piston is heated from 9.1°C to 883.6°C at 1.30 atm. Calculate the work of expansion (include sign) in joules (1 J = 9.87à—10-3 atm L). Assume all of the energy is used to do work.

Reactions

A compound of iron and oxygen is found to have a mass of 6.13 grams. If the mass of iron is determined to be 4.29grams, what is the empirical formula of the compound? Please give step by step answer in simplest way to do not making it complicated. Show all steps and solution please.... (See attachment for rest of questio ...continues

Practice Questions

Please show step by step in a simple way how they got PBCOsub3 + NANOsub3. Then why is Nosub3 not split up like Pb(charge 2+)? Why is PBCOsub3 not split up?... (See attachment for rest of questions)