If the cylinder is full of air at 71 ∘C∘C and 0.980 atmatm , how many moles of O2O2 are present? (The mole fraction of O2O2 in dry air is 0.2095.)

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space