I’m so lost and I need a further explanation for problems 16-19 . I’m not sure h

Question

I’m so lost and I need a further explanation for problems 16-19 . I’m not sure how my teacher got his answers and I want to compare my answer with yours. Please show me your steps so I can chat with you and understand. Please remember Chegg's 5 subsets per question policy, which means that you must go over 16-19 in order for it to be considered as a complete answer.
16. A sample of phosphorus trifluoride, PFs, contains 1.400 moles of the substance. How many atoms are there in the sample? A) 4 B) 5.6 C) 8.431 x 1023 D) 2.409 x 104 E) 3.372 x 1024 17. A sample of sulfolane, CH OS, contains 5.00 x 1024 atoms. How many moles of sulfolane are there in the sample? A) 0.120 moles B) 0.554 moles C) .81 moles D) 8.30 moles E) 3.33 x 103 moles 18. The atomic weight of chromium is 51.996 u. How many moles of Cr are there in a 5.44 g sample of chromium? A) 0.0875 moles B) 0.0907 moles C) 0.105 moles D) 0.220 moles E) 2.33 moles 19. How many moles of carbon atoms are combined with 1.2 moles of hydrogen atoms in a sample of the compound, CsHs? A) 3.00 B) 5.60 C) 4.20 D) 6.02 x 10 E) 29.9

Explanation / Answer

Answer:

16) Given moles of PF3 are 1.4 moles.

Here we have four atoms in 1 PF3, so number of moles of PF3 =4x1.4 moles=5.6 moles

We know that 1 mole contains 6.023x1023 atoms (Avgadro's number).

So here we have 5.6 moles, so the number of atoms in the sample=5.6x6.023x1023 atoms=3.372x1024 atoms.

So E is correct.

As per guidelines I answered first question

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