Two people are trying to push a large box across a floor. Each person pushes with an equal amount of force. The total amount of force they exert on the box is 500 newtons. Despite their efforts, the box does not move. What is the amount of force exerted by the box on the two people?

0 newtons

250 newtons

500 newtons

1500 newtons

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

The arrangement of particles is most ordered in a sample of

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.