Determine the mass in grams of 3.13 × 10²¹ atoms of arsenic. (The mass of one mole of arsenic is 74.92 g.

Atank contains 240 liters of fluid in which 10 grams of salt is dissolved. brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 l/min; the well-mixed solution is pumped out at the same rate. find the number a(t) of grams of salt in the tank at time t.

Which best describes how johannes kepler developed his laws of planetary motion

The point along a planet's orbit where it is closest to the sun is called the