β-carotene is the most important vitamin A. Its molar mass can be determined by measuring the osmotic pressure generated by a given mass of β-carotene dissolved in the chloroform solvent. Calculate the molar mass and β-carotene if 10.0 mL of a solution containing 0.00768 g of β-carotene it has an osmotic pressure of 0.035 atm at 25 °C. Consider that the constant of ideal gases R is 0.082057 L. atm/K. mol.

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?