Gastric acid pH can range from 1 to 4, and most of the acid is HCl.

For a sample of stomach acid that is 1.71×10−2 M in HCl, how many moles of HCl are in 13.1 mL of the stomach acid?

Express the amount to three significant figures and include the appropriate units.

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

Acontrol during an experiment. might change remains constant does not exist does change