What is the mass of:a)  0.1 moles of Nab)  0.5 moles of Cc)  2 moles of Bd)  5 moles of Cu

To find the mass of a substance, we need to use the molar mass. The molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol).

a) To find the mass of 0.1 moles of Na, we need to know the molar mass of Na. The molar mass of Na is 22.99 g/mol. Therefore, the mass of 0.1 moles of Na is calculated as follows:

Mass = Number of moles × Molar mass Mass = 0.1 moles × 22.99 g/mol Mass = 2.299 g

Therefore, the mass of 0.1 moles of Na is 2.299 grams.

b) To find the mass of 0.5 moles of C, we need to know the molar mass of C. The molar mass of C is 12.01 g/mol. Therefore, the mass of 0.5 moles of C is calculated as follows:

Mass = Number of moles × Molar mass Mass = 0.5 moles × 12.01 g/mol Mass = 6.005 g

Therefore, the mass of 0.5 moles of C is 6.005 grams.

c) To find the mass of 2 moles of B, we need to know the molar mass of B. The molar mass of B is 10.81 g/mol. Therefore, the mass of 2 moles of B is calculated as follows:

Mass = Number of moles × Molar mass Mass = 2 moles × 10.81 g/mol Mass = 21.62 g

Therefore, the mass of 2 moles of B is 21.62 grams.

d) To find the mass of 5 moles of Cu, we need to know the molar mass of Cu. The molar mass of Cu is 63.55 g/mol. Therefore, the mass of 5 moles of Cu is calculated as follows:

Mass = Number of moles × Molar mass Mass = 5 moles × 63.55 g/mol Mass = 317.75 g

Therefore, the mass of 5 moles of Cu is 317.75 grams.