A1,900-m 3 water tower has been cleaned with a chlorine solution. the va-pors of chlorine in the tower exceed allowable concentrations for the work crew to enter and finish repairs. if the chlorine concentration is 15 mg/m 3 and the allowable concentration is 0.0015 mg/l, how long must the work-ers vent the tank with clean air flowing at 2.35 m 3 /s? although chlorine is a reactive substance, you may consider it nonreactive for this problem.

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.