@X@user.full_name@X@ @GMU: A 27.70 mL sample of H2SeO4 was neutralized by exactly 34.90 mL of 0.1618M Ca(OH)2. What was the molarity of H2SeO4?H2SeO4(aq) + Ca(OH)2(aq) → CaSeO4(aq) + 2H2O(l)

@X@user.full_name@X@ @GMU: Suppose an element consists of two isotopes having masses of 78.80 amu and 80.11 amu. The abundance of the first isotope is 24.87%. What is the average molecular mass?

@X@user.full_name@X@ @GMU: What is the molar heat capacity of Na if it took 14.205 J to increase the temperature of 15.31 g of it by 7.543°C?

@X@user.full_name@X@ @GMU: The density of a particular gas is 0.1513 g/L at 720.96 mm Hg and 32.73 °C. Which gas is it?

@X@user.full_name@X@ @GMU: What is the molarity of NaClO4 if 7.531 g was dissolved in exactly 100 mL?

@X@user.full_name@X@ @GMU: A gas mixture contains an unknown amount of UF6 and 0.1159 mol of N2. How many moles of UF6 are there, if the total pressure is 529.89 mm Hg and the partial pressure of UF6 is 304.79 mm Hg?

@X@user.full_name@X@ @GMU: The average speed of O3 molecules (atoms) was 470.5 m/s. What was the temperature of the gas?

@X@user.full_name@X@ @GMU: The density of a particular gas is 0.7265 g/L at 701.22 mm Hg and 36.50 °C. What is the molecular mass of the gas?

@X@user.full_name@X@ @GMU: Suppose an element consists of two isotopes having masses of 65.39 amu and 66.41 amu. The abundance of the first isotope is 51.75%. What is the average molecular mass?

@X@user.full_name@X@ @GMU: How many grams of NO must one react with a stoichiometric amount of O2 to produce -10.78 kJ?2NO(g) + O2(g) → 2NO2(g) ΔH = -114 kJ