Noting that pressure is a force over a area (p=f/a, and the equation for gravitational force is f= m x g (where m is the masses of a person in kilograms and g=9.8m/s^2), what pressure [in n/m^2, which is also called pascal (pa)] would be exerted if a 65 kg person were sitting on a stool with a seat diameter of 12 inches?

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

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Will mark brainliest how many electrons can be held in the energy level n = 4?