If a sample of gallium totals 1.22 mol, what is the mass of the sample?

a. 85.06 g
b. 0.01176 g
c. 57.15 g
d. 1.00 g

The answer to your question is the letter a. 85.06 g

Explanation:

Data

1.22 moles of Ga

Process

1.- Look for the Atomic mass of Ga in the periodic table

Atomic mass = 69.72 g

2.- Use proportions to calculate the moles of Ga

                        69.72 g 1 mol

                             x       1.22 moles

                             x = (1.22 x 69.72) / 1

                             x = 85.06/ 1

                             x = 85.06 g og Ga

The mass of this gallium sample is 85.06 grams ( option A is correct).

Explanation:

Step 1: Data given

Number of moles of galium = 1.22 moles

Atomic mass of galium = 69.723 g/mol

Step 2: Calculate mass of gallium

Mass of gallium = moles gallium * molar of gallium

Mass of gallium = 1.22 moles * 69.723 g/mol

Mass of gallium = 85.062  ≈ 85.06 grams

The mass of this gallium sample is 85.06 grams ( option A is correct).

h

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.