Check what i have and
what is the mass, in grams, of a sample of 6.12 × 10^24 atoms of manganese (mn)? show your work or explain the steps that you used to determine your answer.

what i have:
[6.12 x 10^24 atoms] / [6.02 x 10^23 moles/atoms] = 10.2 moles mn
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After cloud droplets form, what must happen to them for precipitation to occur?

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).

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.