- What volume does 0.25 moles of helium occupy at 742 mm Hg & 21*C?

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Find the perimeter of a circular sector with a radius of 5 meters and an area of 17 square meters.? How can a trillion events be measured in the span of a microsecond? How do cows have milk? If you weigh out 2.105 grams of sand / salt mixture and end up with 1.095 grams of dry sad what is the percent of sand in their original mix? Can any electric engineer send me his email please?