QuestionFind the number of nanomoles () in a 22.5 microgram () sample of gold. Answer to 3 sig figs.
Studdy Solution
STEP 1
Assumptions1. The sample of gold is22.5 micrograms ().
. The atomic mass of gold (Au) is197.0 g/mol.
3. We need to convert the mass of the gold sample to nanomoles (nmol).
4. We will use the conversion factor that1 mole of a substance contains entities (Avogadro's number).
5. We will use the conversion factor that1 mole = nmol.
6. We will use the conversion factor that1 g = .
STEP 2
First, we need to convert the mass of the gold sample from micrograms () to grams (g) using the conversion factor that1 g = .
STEP 3
Now, plug in the given value for the mass of the gold sample to calculate the mass in grams.
STEP 4
Calculate the mass of the gold sample in grams.
STEP 5
Now that we have the mass of the gold sample in grams, we can convert this to moles using the atomic mass of gold.
STEP 6
Plug in the values for the mass of the gold sample and the atomic mass of gold to calculate the number of moles.
STEP 7
Calculate the number of moles of the gold sample.
STEP 8
Now that we have the number of moles of the gold sample, we can convert this to nanomoles using the conversion factor that1 mole = nmol.
STEP 9
Plug in the value for the number of moles to calculate the number of nanomoles.
STEP 10
Calculate the number of nanomoles of the gold sample.
The22.5 microgram sample of gold is114 nanomoles.
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