Suppose the mole number of ca2+ ions in a 50 ml water sample is quantified as 1.5 × 10−5 mol. what is the concentration of ca2+ ions in the water sample in ppm caco3?

Explanation for basic character?

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

Isopropyl alcohol, (ch3)2choh, is a common solvent. determine the percent by mass of hydrogen in isopropyl alcohol. a) 6.71% h b) 13.4% h c) 25.0% h d) 53.3% h