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What is the mass of lead?

Lead (Pb) has the atomic number 82 with an Atomic Mass of 207.2 amu.


How can we Calculate the numbers of atoms in 10 grams of gold?

To calculate the number of atoms in 10 grams of gold, first determine the molar mass of gold, which is approximately 197 grams per mole. Using Avogadro's number, which is (6.022 \times 10^{23}) atoms per mole, you can find the number of moles in 10 grams of gold by dividing 10 grams by the molar mass (197 g/mol). Finally, multiply the number of moles by Avogadro's number to find the total number of atoms: [ \text{Number of atoms} = \left( \frac{10 \text{ g}}{197 \text{ g/mol}} \right) \times 6.022 \times 10^{23} \text{ atoms/mol} \approx 3.05 \times 10^{22} \text{ atoms}. ]


Why does 10 grams of nitrogen gas contains the same number of molecules as 10 grams of carbon dioxide?

The density of O2 is 31.9988 grams per mole, meaning there are 0.143 grams and 4.47 mmols present. The density of NH3 is 17.0305 grams per mole, giving 4.09 mmols of ammonia. This means that they have approximately the same number of mmoles, thus the same number of molecules.


Why does 10 gram of nitrogen gas contain the same number of molecules as 10 gram of carbonmonoxide?

Both nitrogen gas and carbon monoxide have the same molecular weight, around 28 grams per mole. Therefore, 10 grams of each substance contain approximately one-third of a mole of molecules. Since Avogadro's number (6.022 x 10^23) represents the number of molecules in one mole of a substance, both 10 grams of nitrogen gas and 10 grams of carbon monoxide contain the same number of molecules, which is roughly 2 x 10^23.


How many grams are in 8.2 x 10 to the 22 molecules of N2I6?

To convert molecules to grams, you need to use the molar mass of the compound. For N2I6, the molar mass is 539.59 g/mol. First, calculate the number of moles in 8.2 x 10^22 molecules by dividing the number of molecules by Avogadro's number. Then, multiply the number of moles by the molar mass to find the grams.