2. How many molecules are in 10.0 moles of Carbon dloxide? Answer: 3. How many formula units are in 0,670 moles of Iron (II) oxide? Answer: 4. How many molecules are in 0.63 moles of Nitrogen monoxide? Answer: 5. How many moles are 3.9times 10^20 Magnesium atoms? Answer: 6. How many moles contain 4.6times 10^24 Sulfur atoms? Answer: 7. "How many atoms are in 1.00 mol of H_(2)O Answer: 1.81times 10^24atoms

2. The number of molecules in 10.0 moles of Carbon dioxide can be calculated using Avogadro's number, which is $6.022\times 10^{23}$ molecules/mol. Therefore, the number of molecules in 10.0 moles of Carbon dioxide is $10.0 \times 6.022\times 10^{23} = 6.022\times 10^{24}$ molecules.<br /><br />3. The number of formula units in 0.670 moles of Iron (II) oxide can be calculated using Avogadro's number, which is $6.022\times 10^{23}$ formula units/mol. Therefore, the number of formula units in 0.670 moles of Iron (II) oxide is $0.670 \times 6.022\times 10^{23} = 4.044\times 10^{23}$ formula units.<br /><br />4. The number of molecules in 0.63 moles of Nitrogen monoxide can be calculated using Avogadro's number, which is $6.022\times 10^{23}$ molecules/mol. Therefore, the number of molecules in 0.63 moles of Nitrogen monoxide is $0.63 \times 6.022\times 10^{23} = 3.793\times 10^{23}$ molecules.<br /><br />5. The number of moles in $3.9\times 10^{20}$ Magnesium atoms can be calculated using Avogadro's number, which is $6.022\times 10^{23}$ atoms/mol. Therefore, the number of moles in $3.9\times 10^{20}$ Magnesium atoms is $\frac{3.9\times 10^{20}}{6.022\times 10^{23}} = 6.49\times 10^{-4}$ moles.<br /><br />6. The number of moles in $4.6\times 10^{24}$ Sulfur atoms can be calculated using Avogadro's number, which is $6.022\times 10^{23}$ atoms/mol. Therefore, the number of moles in $4.6\times 10^{24}$ Sulfur atoms is $\frac{4.6\times 10^{24}}{6.022\times 10^{23}} = 7.64$ moles.<br /><br />7. The number of atoms in 1.00 mol of $H_{2}O$ can be calculated by multiplying the number of molecules in 1.00 mol of $H_{2}O$ by the number of atoms per molecule of $H_{2}O$. Since there are 3 atoms in each molecule of $H_{2}O$, the number of atoms in 1.00 mol of $H_{2}O$ is $1.00 \times 6.022\times 10^{23} \times 3 = 1.81\times 10^{24}$ atoms.