Use the average atomic mass to calculate the mass in grams of each of the follow

Question

Use the average atomic mass to calculate the mass in grams of each of the following samples. 0.251 mole of lithium 1.51 moles of aluminum 8.75 times 10^3 moles of lead 125 moles of chromium Use the average atomic mass to calculate the mass in grams of each of the following samples. 0.00552 mole of calcium 6.25 mmol of boron (1mmol = 1/1000 mole) 135 moles of aluminum 1.34 times 10^7 moles of barium 0.0000997 mole of arsenic Write the formula and calculate the molar mass for each of the following substances. barium chloride aluminum nitrate

Explanation / Answer

a) Atomic mass of Lithium = 6.94 amu (atomic mass unit)

therefore 0.251 moles of Li = 6.94 x 0.251 = 1.49 g (gram)

b)Atomic mass of Al = 26.98 amu

1.51 moles of Al = 1.51 x 26.98 = 40.74 g

c) Atomic mass of lead (Pb) = 207.2 amu

8.75 x 10-2 moles of Al = 8.75 x 10-2 x 207.2 = 18.13 g

d) Atomic mass of Chromium = 52 amu

125 moles of Al = 125 x 52 = 6500 g

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