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Gallium, Ga, has two isotopes of atomic mass 68.926 u and 70.926 u. Write the full symbol for each isotope (give both A and Z for each isotope). How many protons, and how many neutrons are present in the nucleus of each isotope? What is the natural abundance of each isotope, if the average atomic mass of gallium is 69.72 u?
How many grams of H2O (g) are theoretically produced from 1026.9 g of sucrose, C12H22O11 (g), and an excess amount of oxygen? C12H22O11 (g) + O2 (g) → CO2 (g) + H2O (g) (unbalanced)
what amount of heat would need to be added to 5.0 x 103 g of water to change its temperature from 21c to 84c?
Mixture also contains He (helium gas). determine the partial pressure of the He gas?
Explain how these products are produced by showing the mecahnism involved. (draw).
The explosive, TNT, is composed of 37.0% carbon, 2.2% hydrogen, 18.5% nitrogen and the rest oxygen. if the molar mass of TNT is 227 g/mol, what is the empirical and molecular formula for TNT?
Write balanced chemical equations for the following reactions.
Consider the following isomerization reactions of some simple sugars and values for their standard Gibbs free energy ΔG °:
it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2] = 0.0500 M, [F2] = 0.0100 M, and [HF] = 0.400 M. If 0.338 mol of F2 is added to this equilibrium mixture, calculate the concentrations of all gases once equilibri..
you dissolve 15.0g of sucrose C12H22O11 in a cup of water (225g) what is the freezing point of solution (kf of water is -1.86).
At 25 oC the solubility of copper(II) iodate is 3.27 x 10-3 mol/L. Calculate the value of Ksp
A graduated cylinder contains 129 mL of water. A 17.0 g piece of iron (density = 7.86 rm{g/cm^3}) and a 17.0 g piece of lead are added. What is the new water level in the cylinder?
A 99.8mL sample of a solution that is 12.0% KI by mass(d=1.093g/mL) is added to 96.7mL of another solution that 14.0%Pb(NO3)2 by mass (d=1.134g/mL). How many grams of PbI2 should form.
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