Physical Chemistry Answers

Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.229 g
g of naphthalene burns in a bomb calorimeter, the temperature rises from 24.604 ∘C to 30.460 ∘C.

Find ΔrU for the combustion of naphthalene. The heat capacity of the calorimeter, determined in separate experiment, is 5.112 kJ∘C−1.

Determine the number of formula units present in a 3.7 mole sample of CuBr

1cm^3 of 0.1M of NaOH=0.011g of casein. calculate the g/100cm^3 of the casein in milk.
values got from my results are below;
mass of the milk= 5.04g
mass of the casein precipitate=7.89g
volume(cm^3) of the acid used=43.50 of Hcl
Molar conc of Hcl = 0.1
Molar conc of NaOH=0.1

2) Also calculate the amount of casein in mg/L

5. A sealed vessel was filled with 0.400 mol of H2 and 0.500 mol of I2, and the temperature was raised to 870 K. At equilibrium, it was found that 0.786 mol of HI had formed according to the reaction
H2(g) + I2(g) ⇌ HI(g)

(a) Calculate the equilibrium constant Kp at this temperature

The vapor pressure of component A for a binary mixture (A and B) is given by the equation below:

PA = 6.1xAe-0.65xB + 1.6xB*xB

What is henry's law constant for component A?

The pressure of the oxygen gas inside a canister with a fixed volume is 5.0atm at 15oC. What is the pressure of the oxygen gas inside the canister if the temperature changes to 263K? Assume the amount of gas remains constant.

Collecting data on mass, volume, and length of various samples of matter are?

A balloon containing 5470cm3 of helium gas has a mass of 10.24g the mass of the empty balloon is 2.42g. What is the density of the balloon?

4. Two bulbs, 1.00 L and 1.50 L in volume, connected by a stopcock, are filled, respectively,
with argon at 0.75 atm and helium at 1.20 atm at the same temperature. Calculate the mole
fraction of each gas, total pressure and partial pressure of each gas after the stopcock is
opened. Assume ideal gas behaviour.