My first post here...and I'm asking questions. I feel kind of like an ingrate for not participating and instantly demanding x_x
But no matter...could I have some assistance with the following 6 problems? The help is VERY much appreciated as this is a summer assignment for a class next year and it's worth a lot of points, I think. Also, I have all the answers to the problems but I need to know how to solve them/get some hints on how to solve them.
1. Calculate the specific heat of water in units of kcal/lb*degF. (Given information: Specific healt of water = 1.00 cal/g*decC; 1 lb = 454 g, deg C = 5/9F - 32)
2. What mass of sodium nitrate is required to produce 5.00 L of oxygen gas according to the following reaction if there is a 78.4% yield?
(Given information: density of O2 = 1.43 g/L; 2NaNO3---> 2NaNO2 + O2)
3. A 3.113 g sample of cementite was heated in air producing 4.153 g of Fe2O3. The CO2 gas, another product of the reaction, escaped. What is the empirical formula of cementite?
4. Reaction of rhenium metal w/ Re2O7 gives a solid of metallic appearance which conduts electricity almost as well as copper. A 0.788 g sample of this material, which contains only rhenium and oxygen, was oxidized in an acidic solution of hydrogen peroxide. Addition of an excess of KOH gave 0.973 g of KReO3. What is the equation for the reaction of Re with Re2O7?
5. What mass of a sample that is 98.0% sulfur would be required in the production of 75.0 kg of H2SO4 by the following reaction sequence?
S8 + 8O2 -> 8SO2
2SO2 + O2 -> 2 SO3
SO3 + H2O -> H2SO4
Thanks so much and I hope you have fun helping me out
