Asample that weighs 107.75 g is a mixture of 30% helium atoms and 70% krypton atoms. how many particles are present in the sample?

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).

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Why is permeable soil best for plants that need a lot of drainage?