6. which of the following is the molar mass of lead (ii) oxide? (write a formula first.)\n a. 430.4 g/mol\n…

6. which of the following is the molar mass of lead (ii) oxide? (write a formula first.)\n a. 430.4 g/mol\n b. 223.2 g/mol\n c. 239.2 g/mol\n d. none of these\n7. what is the molar mass of the compound formed from magnesium and iodine? (write a formula first.)\n a. 151.2 g/mol\n b. 278.1 g/mol\n c. 175.5 g/mol\n d. none of these

6. which of the following is the molar mass of lead (ii) oxide? (write a formula first.)\n a. 430.4 g/mol\n b. 223.2 g/mol\n c. 239.2 g/mol\n d. none of these\n7. what is the molar mass of the compound formed from magnesium and iodine? (write a formula first.)\n a. 151.2 g/mol\n b. 278.1 g/mol\n c. 175.5 g/mol\n d. none of these

Answer

Explanation:

Step1: Determine the formula of lead (II) oxide

Lead (II) has a charge of +2 and oxide has a charge of -2. The formula is $PbO$.

Step2: Calculate molar mass of $PbO$

The molar mass of $Pb$ is approximately 207.2 g/mol and of $O$ is 16.0 g/mol. So, $M_{PbO}=207.2 + 16.0=223.2$ g/mol.

Step3: Determine the formula of the compound from magnesium and iodine

Magnesium has a charge of +2 and iodine has a charge of -1. The formula is $MgI_{2}$.

Step4: Calculate molar mass of $MgI_{2}$

The molar mass of $Mg$ is approximately 24.3 g/mol and of $I$ is 126.9 g/mol. So, $M_{MgI_{2}}=24.3+2\times126.9 = 24.3 + 253.8=278.1$ g/mol.

Answer:

  1. b. 223.2 g/mol
  2. b. 278.1 g/mol