Mass is the amount of content available in the matter. The mass of the moles of samples given are
2 moles Co = 117.86 g Co
5 moles H2 = 10.10 g H₂
2.1 moles H₂O = 37.84 g H₂O
A mole can be atoms or molecules or ions or any substance.
The mass of one mole of Co is 58.93 g.
Then, 2 moles of Co will be 2 x 58.93 g = 117.86 g Co
The mass of one mole of H₂ is 2.02 g.
Then, 5 moles of H₂ will be 5 x 2.02 g = 10.10 g H₂
The mass of one mole of H₂O is 18.02 g .
Then, 2.1 moles of H₂O will be 2.1 x 18.02 g = 37.84 g H₂O
Thus, the mass of the following samples in grams
2 moles Co = 117.86 g Co
5 moles H₂= 10.10 g H₂
2.1 moles H₂O = 37.84 g H₂O
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