@X@user.full_name@X@ @GMU: The average speed of HBr molecules (atoms) was 406.9 m/s. What was the temperature of the gas?

@X@user.full_name@X@ @GMU: When 2.931 g of urea was dissolved in 100.6 g of benzene, the freezing point was 276.2 K. What is the formula mass of this compound? The freezing point depression constant for benzene is 5.12 (°C*kg)/mol. The melting point and boiling points are 5.50°C and 80.10°C, respectively.

@X@user.full_name@X@ @GMU: Which product in the reaction below is an acid (this one first in the answer) and which product is a base?BrO- + HCO-3 → HBrO + CO3-

What politically was placed that halted trade with Europe? 

_________ is a depressive disorder characterized by a chronically sad and melancholy mood nearly every day for at least two years.

@X@user.full_name@X@ @GMU: When 10.52 g of aspirin was dissolved in 104.9 g of benzene, the freezing point was 275.7 K. What is the formula mass of this compound? The freezing point depression constant for benzene is 5.12 (°C*kg)/mol. The melting point and boiling points are 5.50°C and 80.10°C, respectively.

@X@user.full_name@X@ @GMU: Uranium -238 decays in a series of steps to Pb-206. When the material is very old, one can treat the kinetics as a decay directly to Pb and the ratio of these two can be treated as a measure of the age of a rock. A rock containing 238U and 206Pb was examined to determine its approximate age. The molar ratio of 206Pb to 238U was 0.2212. Assuming no lead was originally present and that all lead formed remained in the rock, what is the age of the rock (in years)? The half-life of 238U is 4.50e9 yr.

@X@user.full_name@X@ @GMU: The temperature of 11.95 g of Fe increased by 8.58°C when heated. How much heat did it absorb if the heat capacity of Fe is 25.100 J/°C×mol?

Who was the first Secretary of State? 

@X@user.full_name@X@ @GMU: For which species should the central atom have a hybridization of sp3?