7. A silver charm has a mass of 25 .0 grams. How many atoms of silver are there? 8. What is heavier a mole of water or a mole of carbon dioxide; show proof to back up your claim. 9. How heavy (in grams) will 6.14times 10^25 atoms of gold be?

7. To find the number of atoms of silver in a silver charm with a mass of 25.0 grams, we need to use the molar mass of silver and Avogadro's number.The molar mass of silver (Ag) is 107.87 g/mol. This means that 1 mole of silver has a mass of 107.87 grams.Avogadro's number is 6.022 x 10^23 atoms/mol. This means that 1 mole of any substance contains 6.022 x 10^23 atoms.To find the number of atoms of silver in the silver charm, we can use the following steps:1. Convert the mass of the silver charm to moles: Mass of silver charm = 25.0 grams Molar mass of silver = 107.87 g/mol Moles of silver = Mass of silver charm / Molar mass of silver Moles of silver = 25.0 grams / 107.87 g/mol = 0.2306 moles2. Convert the moles of silver to the number of atoms: Number of atoms = Moles of silver x Avogadro's number Number of atoms = 0.2306 moles x 6.022 x 10^23 atoms/mol = 1.39 x 10^23 atomsTherefore, there are approximately 1.39 x 10^23 atoms of silver in the silver charm.8. To determine which is heavier, a mole of water or a mole of carbon dioxide, we need to compare their molar masses.The molar mass of water (H2O) is 18.015 g/mol, which means that 1 mole of water has a mass of 18.015 grams.The molar mass of carbon dioxide (CO2) is 44.01 g/mol, which means that 1 mole of carbon dioxide has a mass of 44.01 grams.Since the molar mass of carbon dioxide (44.01 g/mol) is greater than the molar mass of water (18.015 g/mol), a mole of carbon dioxide is heavier than a mole of water.Proof:Molar mass of carbon dioxide (CO2) = 44.01 g/molMolar mass of water (H2O) = 18.015 g/molSince 44.01 g/mol > 18.015 g/mol, a mole of carbon dioxide is heavier than a mole of water.9. To find the mass of atoms of gold, we need to use the molar mass of gold and Avogadro's number.The molar mass of gold (Au) is 197.0 g/mol. This means that 1 mole of gold has a mass of 197.0 grams.Avogadro's number is 6.022 x 10^23 atoms/mol. This means that 1 mole of any substance contains 6.022 x 10^23 atoms.To find the mass of atoms of gold, we can use the following steps:1. Convert the number of atoms to moles: Number of atoms = Avogadro's number = 6.022 x 10^23 atoms/mol Moles of gold = Number of atoms / Avogadro's number Moles of gold = atoms / 6.022 x 10^23 atoms/mol = 102.3 moles2. Convert the moles of gold to the mass: Molar mass of gold = 197.0 g/mol Mass of gold = Moles of gold x Molar mass of gold Mass of gold = 102.3 moles x 197.0 g/mol = 20156.1 gramsTherefore, atoms of gold will have a mass of 20156.1 grams.