Question

The chemical formula for magnesium oxide is MgO. A chemist measured the amount of magnesium oxide produced during an experiment. She finds that 401. g of magnesium oxide is produced. Calculate the number of moles of magnesium oxide produced. Be sure your answer has the correct number of significant digits

Answer 1

To calculate the number of moles of magnesium oxide produced, divide the mass of MgO by its molar mass.

Step-by-step explanation:

To calculate the number of moles of magnesium oxide produced, we need to use the molar mass of MgO. The molar mass of MgO is calculated by adding the atomic masses of magnesium (24.305 g/mol) and oxygen (16.00 g/mol). So, the molar mass of MgO is 24.305 g/mol + 16.00 g/mol = 40.305 g/mol.

Next, we can use the given mass of magnesium oxide (401 g) and the molar mass of MgO to calculate the number of moles. We divide the mass by the molar mass:

401 g ÷ 40.305 g/mol = 9.947 moles

Therefore, the number of moles of magnesium oxide produced is approximately 9.947 moles, rounded to the correct number of significant digits.

Answer 2

To find the number of moles of magnesium oxide (MgO) produced from 401 g, you divide the mass by the molar mass of MgO (40.305 g/mol), resulting in approximately 9.94 moles with the correct significant digits.

Step-by-step explanation:

To calculate the number of moles of magnesium oxide produced from 401 g, we must use the molar mass of magnesium oxide (MgO). The molar mass of magnesium oxide is approximately 24.305 g/mol (Mg) + 16.00 g/mol (O) = 40.305 g/mol (MgO). Using this molar mass, the number of moles can be calculated by dividing the mass of the compound by its molar mass.

Number of moles = Mass of magnesium oxide / Molar mass of magnesium oxide

Number of moles = 401 g / 40.305 g/mol = 9.945 moles of MgO

It is important to use the correct number of significant digits. The mass of magnesium oxide is given to three significant digits, so the final answer should be reported to three significant digits as well. Therefore, the number of moles of magnesium oxide produced is approximately 9.94 moles.