Calculate the mass in atomic mass units of 0.25 mol of carbon-12 atoms

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h