Elise earned 2100$ as a monthly salary in 2016. In 2017, she got a 3% pay increase on her monthly salary. So, in 2017 she got a monthly salary of (1+3/100)*2100= 2163$. Then her yearly salary in the year 2017 became (2163*12) =25956$. Now, in 2017 Elise 42 hours per week for 45 weeks. Hence, in 2017, Elise worked for (42*45) =1806 hours.
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Well, you need to know the atomic weight of Platinum (Pt) and the number of atoms per mole. The answer to the former is 195.084 g/mole and the latter is 6.023 * 10^23 atoms/mole. Then, multiply everything as shown below:
Number of atoms = (1 g) * (1/195.084 g/mole) * 6.023 * 10^23 atoms/mole
Number of atoms = 3.087 * 10^21 atoms
Note, I’ve included units on everything and you can see that they all cancel except for atoms. Dragging the units along can be a pain but it is a great way to check that they way the numbers are being combined is correct.
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