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Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more com- plicated, but this is a reasonable first ap- proximation.) The combustion of carbon is described by the equation
C(s) + O2(g) -→ CO2(g) ?H? = -394 kJ What is the value of q (heat) when a lump of coal of size 8.6 cm×8.1 cm×7.6 cm is burned? Answer in units of kJ.What mass of water can be heated from 15?C to 100?C by burning this piece of coal?
Calculate the number of moles of HCl that would be consumed by 1.0 g of NaHCO3
use the concept mof electron configuration to explain why the number of valence electrons in metals tend to be less the number in most nonmetals.
A solution contains 2.2 × 10-3 M in Cu2+ and 0.33 M in LiCN. If the Kf for Cu(CN)42- is 1.0 × 1025, how much copper ion remains at equilibrium
Draw all of the resonance structure of SCP-.write formal charges on All atoms. point out which one has most likely resonance
Given the heat of combustion for the following reactions, determine the enthalpy of formation for pentane, C5H12.
Construct a graph of the Maxewell distribution of speeds (equation 20.4 in Atkins Book) for Cl2 at 100 K and 298 K using excel or mathematica.
express the velocity of the electron in the Bohr model for fundamental constants, the nuclear charge Z, and the quantum number n. Evaluate the velocity of an electron in the ground states of He+ ion and U91+.
What is the pH change of a 0.200M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.175M with no change in volume?
a) what is the total pressure in the reaction vessel b) what is the partial pressure of N2 c) If the volume of the reaction vessel is decreased to 5.0 L, would you expect the pressure of the gases to increase or decrease
At a certain temperature and pressure 2.8 L of N2 reacts with 4.2 L of O2. If all the N2 and O2 are consumed, what volume of N2O3, at the same temperature and pressure, will be produced?
Two isomeric compounds, A and B, are known to each have a monosubstituted benzene ring. Both have the formula C9H10O2 and both are insoluble in water. However, A dissolves in dilute aqueous NaOH, but B does not.
A 250.0 mL sample of chlorine gas is collected when the barometric pressure is 798 mmHg. What is the volume of the sample after the barometric pressure dropped to 745 mmHg?
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