your mommy buys you a helium balloon at a circus. It has a volume of 4.00 liters at stp. what mass of helium, express in gram, does this balloon contain? answer

Base your answer on the information below and on your knowledge of chemistry. nitrogen dioxide, no2, is a dark brown gas that is used to make nitric acid and to bleach flour. nitrogen dioxide has a boiling point of 294 k at 101.3 kpa. in a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, n2o4. this equilibrium is represented by the equation below. 2no2(g) n2o4(g) + 58kj at standard pressure, compare the strength of intermolecular forces in no2(g) to the strength of intermolecular forces in n2(g).

What is dhmo? hint: you find it everywhere something is wet..

In in , is to a 28.4-g (1-oz)−23.0 °c to −1.0 °c?