You need to know that one mole is 6.022 x 1023 particles (atoms, molecules, ions, formula units, etc...).
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In 1 gram of any substance, the number of particles can vary depending on the substance's molecular weight and Avogadro's number. To calculate the number of particles, you would first need to determine the molar mass of the substance in grams per mole. Then, you would use Avogadro's number, which is approximately 6.022 x 10^23 particles per mole, to find the number of particles in 1 gram of the substance.
Oh honey, let me break it down for you. Avogadro's number tells us that 1 mole is equal to 6.022 x 10^23 atoms. So, to find out how many moles are in 1.25 x 10^25 atoms of phosphorus, you just need to divide the number of atoms by Avogadro's number. That gives you approximately 20.75 moles of phosphorus.
What you need to do depends on what you wish to achieve.
To determine the number of moles in 0.000264 g of Li2HPO4, you first need to calculate the molar mass of Li2HPO4. The molar mass of Li2HPO4 is 115.79 g/mol. Next, you can use the formula n = m/M, where n is the number of moles, m is the mass in grams, and M is the molar mass. Plugging in the values, you get n = 0.000264 g / 115.79 g/mol ≈ 2.28 x 10^-6 moles of Li2HPO4.
When converting the mols measurement into atomic weight (or vice-versa). Since there are 6.02x10^26 atoms in a mol. There are some keywords you can look for to determine whether or not you need to use Avogadro's number. Look for the keywords ions, molecules, moles (IF grams [g] to moles), and formula units in the question. If the question is asking for any of these terms or involves any of those terms, Avogadro's number will be necessary to use.