Chemistry: Atoms, Mass,and the Mole Directions: Use appropriate conversion factors and unit cancellation to solve the following problems. In order to get full credit, you must show the set-up and include units in all quantitios. 1. Find the number of atoms of phosphorus (P) in 3.44 moles of phosphorus. 2. What is the mass of 0.38 moles of cobalt (Co)? 3. How many moles of nickel (Ni) is 3.88times 10^25 atoms of nickel? 4. How many atoms is 3.75 moles of iron (Fe) 5. Find the number of moles of sodium (Na) in 145 g of sodium. 6. How many moles is 0.55 g of magnesium (Mg)? 7. If you have 7.22times 10^23 atoms of chromium (Cr)how many moles of chromium do you have? 8. What mass of tungsten (W) is 35 moles of tungsten? 9. How many atoms is 5.2 moles of titanium (Ti)

1. To find the number of atoms of phosphorus (P) in 3.44 moles of phosphorus, we can use the conversion factor that 1 mole of any substance contains Avogadro's number of atoms, which is 6.022 x 10^23 atoms.<br /><br />Number of atoms = 3.44 moles * (6.022 x 10^23 atoms / 1 mole)<br />Number of atoms = 2.07 x 10^24 atoms<br /><br />Therefore, there are 2.07 x 10^24 atoms of phosphorus in 3.44 moles of phosphorus.<br /><br />2. To find the mass of 0.38 moles of cobalt (Co), we can use the molar mass of cobalt, which is 58.93 g/mol.<br /><br />Mass = 0.38 moles * (58.93 g / 1 mole)<br />Mass = 22.35 g<br /><br />Therefore, the mass of 0.38 moles of cobalt is 22.35 g.<br /><br />3. To find the number of moles of nickel (Ni) in 3.88 x 10^25 atoms of nickel, we can use the conversion factor that 1 mole of any substance contains Avogadro's number of atoms, which is 6.022 x 10^23 atoms.<br /><br />Number of moles = (3.88 x 10^25 atoms) / (6.022 x 10^23 atoms / 1 mole)<br />Number of moles = 64.6 moles<br /><br />Therefore, there are 64.6 moles of nickel in 3.88 x 10^25 atoms of nickel.<br /><br />4. To find the number of atoms in 3.75 moles of iron (Fe), we can use the conversion factor that 1 mole of any substance contains Avogadro's number of atoms, which is 6.022 x 10^23 atoms.<br /><br />Number of atoms = 3.75 moles * (6.022 x 10^23 atoms / 1 mole)<br />Number of atoms = 2.26 x 10^24 atoms<br /><br />Therefore, there are 2.26 x 10^24 atoms in 3.75 moles of iron.<br /><br />5. To find the number of moles of sodium (Na) in 145 g of sodium, we can use the molar mass of sodium, which is 22.99 g/mol.<br /><br />Number of moles = 145 g / (22.99 g / 1 mole)<br />Number of moles = 6.28 moles<br /><br />Therefore, there are 6.28 moles of sodium in 145 g of sodium.<br /><br />6. To find the number of moles in 0.55 g of magnesium (Mg), we can use the molar mass of magnesium, which is 24.31 g/mol.<br /><br />Number of moles = 0.55 g / (24.31 g / 1 mole)<br />Number of moles = 0.0226 moles<br /><br />Therefore, there are 0.0226 moles in 0.55 g of magnesium.<br /><br />7. To find the number of moles of chromium (Cr) in 7.22 x 10^23 atoms of chromium, we can use the conversion factor that 1 mole of any substance contains Avogadro's number of atoms, which is 6.022 x 10^23 atoms.<br /><br />Number of moles = (7.22 x 10^23 atoms) / (6.022 x 10^23 atoms / 1 mole)<br />Number of moles = 1.2 moles<br /><br />Therefore, there are 1.2 moles of chromium in 7.22 x 10^23 atoms of chromium.<br /><br />8. To find the mass of tungsten (W) in 35 moles of tungsten, we can use the molar mass of tungsten, which is 183.84 g/mol.<br /><br />Mass = 35 moles * (183.84 g / 1 mole)<br />Mass = 6.43 x 10^3 g<br /><br />Therefore, the mass of tungsten in 35 moles of tungsten is 6.43 x 10^3 g.<br /><br />9. To find the number of atoms in 5.2 moles of titanium (Ti), we can use the conversion factor that 1 mole of any substance contains Avogadro's number of atoms, which is 6.022 x 10^23 atoms.<br /><br />Number of atoms = 5.2 moles * (6.022 x 10^23 atoms / 1 mole)<br />Number of atoms = 3.11 x 10^24 atoms<br /><br />Therefore, there are 3.11 x 10^24 atoms in 5.2 moles of titanium.