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The two occuring isotopes of gallium-69 and gallium-71,which are found in the ratio of 3:2. Determine the atomic mass of gallium.
Calculate the number of moles of KHP? b. How many moles of NaOH will react with the KHP dissolved in water? c. Calculate the Molarity of the NaOH solution?
Calculate the work (in kJ) when 2.20 moles of methane react with excess oxygen at 384 K: CH4(g) + 2O2(g) ? CO2(g) + 2H2O(l) Hint
NH3(Ammonia ) is widely used in many household cleaners and as a fertilizer. Calculate How much ammonia (in units of mol) is produced when 7.8 mol of H gas react with an excess of N gas.
How many grams of lead chromate form when a 1.00-g sample of Pb(NO3)2 is added to 5.0 mL of 1.00 M K2CrO4 solution.
Sodium chloride has solubility in water at 100.0°C of 39.1 g sodium chloride per 100 g of water. Calculate the boiling point of a saturated solution of sodium chloride in water.
A solution contains 25 mmol of H3PO4 and 10. mmol of NaH2PO4. What volume of 2.0 M NaOH must be added to reach the second equivalence point of the titration of the H3PO4 with NaOH?
a tank contains helium at 490 mmHg, nitrogen gas at 0.750 atm, and neon at 520 torr. what is the total pressure in atm?
The kinetic energy of the emitted electrons is measured to be 11.7 eV. What is the first ionization energy of Hg in kJ/mol? kJ/mol (d) Using this figure of ionization energies, determine which of the halogen elements has a first ionization energy ..
A person breathes 2.6 L of air at -110 C into her lungs, where it is warmed to 370C. What is its new volume?
Consider the titration of a 22.0 -mL sample of 0.110 M HC2H3O2 with 0.130 M NaOH. Determine each of the following. A. The initial pH B. the volume of added base required to reach the equivalence point in mL
Suppose 2 atm of SO2 reacts, what will be the resulting pressures? Suppose 2 atm of SO2 reacts, what will be the resulting pressures?
What will be the experimental enthalpy of reaction when 0.5000g of zinc reacts with 20.00mL of 1.500M HCl, changing the temperatrure of the solution
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