Calculate the percent by mass of C in NaHCO3 if an 84.0 g sample contains: 23.0 g of Na, 1.0 g of H, 12.0 g of C, and 48.0 g of O. (ONLY TYPE THE NUMBER NOT THE UNIT)

High-pressure liquid chromatography (hplc) is a method used in chemistry and biochemistry to purify chemical substances. the pressures used in this procedure range from around 500 kilopascals (500,000 pa) to about 60,000 kpa (60,000,000 pa). it is often convenient to know the pressure in torr. if an hplc procedure is running at a pressure of 1.03×108 pa , what is its running pressure in torr?