28.01 g/mol is the answer for carbon monoxide (CO)
<span>Hydrogen ion, strictly, the nucleus of a hydrogen atom separated from its accompanying electron. Thehydrogen nucleus is made up of a particle carrying a unit positive electric charge, called a proton. The isolated hydrogen ion, represented by the symbol H +, is therefore customarily used to represent aproton.</span><span>
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<span>the solvent, hope this helps</span>
Ca(OH)2 because Calcium tends to favor a positive 2 charge and OH tensd to favor a negative 1 charge.
Hope I helped with the answer to your question ;)
