Question

The molecular weight of salicylic acid, C7 H6 O3, is 138.12 g/mol. What is the mass, in grams, of 0.802 mol of salicylic acid?

a) 97.33 g
b) 110.76 g
c) 115.22 g
d) 123.21 g

Answer 1

The mass of 0.802 mol of salicylic acid with a molecular weight of 138.12 g/mol is 110.76 g, matching answer choice (b).

Step-by-step explanation:

The mass of 0.802 mol of salicylic acid, which has a molecular weight of 138.12 g/mol, can be calculated by multiplying the number of moles by the molecular weight.

To find the mass in grams:

Mass = moles × molecular weight = 0.802 mol × 138.12 g/mol

After performing the calculation:

Mass = 110.76 g

Therefore, the mass of 0.802 mol of salicylic acid is 110.76 g, which corresponds to answer choice (b).

Answer 2

The mass of 0.802 mol of salicylic acid (C7H6O3) is 110.76 grams.Thus the correct option is B.

Step-by-step explanation:

Salicylic acid has a molecular weight of 138.12 g/mol. To find the mass of 0.802 mol, multiply the number of moles by the molecular weight:
`\(0.802 \, \text{mol} * 138.12 \, \text{g/mol} = 110.76 \, \text{grams}\).`

In the explanation part, salicylic acid's molecular weight is given as 138.12 g/mol. To calculate the mass of 0.802 mol of salicylic acid, use the formula: Mass = Number of moles × Molecular weight. Multiply 0.802 mol by the molecular weight of 138.12 g/mol, which yields 110.76 grams. This calculation involves simple multiplication of the given number of moles by the molecular weight of the compound to determine its mass.

Salicylic acid's molecular weight indicates the mass of one mole of the compound, which is 138.12 grams. Given the number of moles (0.802 mol), multiplying this quantity by the molecular weight yields the total mass of the given moles of salicylic acid. Therefore, 0.802 moles of salicylic acid correspond to 110.76 grams, as calculated using the molecular weight and the given number of moles, providing the accurate mass for the given quantity of the compound.Thus the correct option is B.