Air flows through a pipe with a variable cross section. at the pipe inlet the pressure is 6.0 bars, the temperature is 27? ,the area is 35.0 cm, and the velocity is 60 m/s at the pipe exit the conditions are 5.0 bars and 50°c, and the cross-sectional area is 20.0 cm2. find a) the mass flow rate, in kg/s, and b) the exit velocityin m/s. (1.46 kg/s, 135.7 m/s)

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Plzz a sample of table sugar (sucrose, c12h22o11) has a mass of 7.801 g. ● a) calculate the number of moles of c12h22o11 in the sample b) calculate the number of moles of each element in c12h22o11 (number of moles of c, number of moles of h & number of moles of o) in the sample. (use your answer from part a as your starting point.) show your work and highlight your final answer. calculate the number of atoms of each element in c12h22o11 (number of atoms of c, number of atoms of h & number of atoms of o) in the sample. (use your answers from part b as your starting for each element.) show your work and highlight your final answer.