How many moles of cobalt are in 27.4 grams of cobalt

Number of moles of cobalt can be calculated as given mass of the substance divided by the molar mass of the substance.

Here, given mass of the cobalt = 27.4 g

Molar mass of the cobalt = 58.9 g

Number of moles of a substance= \frac{Given mass of the substance}{Molar mass of the substance}

Number of moles of cobalt= \frac{Given mass of the cobalt}{Molar mass of the cobalt}

=\frac{27.4}{58.9}

=0.465 mol

So, number of moles of cobalt will be 0.465 mol

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.