@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

@X@user.full_name@X@ @GMU: What is 3.47 K on the Fahrenheit scale?

@X@user.full_name@X@ @GMU: A 51.18 mL sample of 0.08538 M HCl was neutralized by exactly 34.61 mL of LiOH. What was the molarity of LiOH?HCl(aq) + LiOH(aq) → LiCl(aq) + H2O(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 structure of the hydrogen sulfate ion?

@X@user.full_name@X@ @GMU: A 54.96 mL sample of 0.2069 M HCN was neutralized by exactly 33.15 mL of Mg(OH)2. What was the molarity of Mg(OH)2?2HCN(aq) + Mg(OH)2(aq) → Mg(CN)2(aq) + 2H2O(l)

@X@user.full_name@X@ @GMU: What hybridization would you expect for the central atom of XeF2?

@X@user.full_name@X@ @GMU: What is the mass (grams) of one atom of galium?

@X@user.full_name@X@ @GMU: What is the empirical formula of a compound if its percent composition is 73.63 % C and 12.36 % H? The compound contains only C, H and O.