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Alisiya [41]
3 years ago
8

How many molecules of PF5 are found in 39.5 grams of PF5?

Chemistry
1 answer:
djyliett [7]3 years ago
7 0

Answer:

1.9 \times 10^{23} molecules of PF_5 are found in 39.5 grams of PF_5.

Explanation:

Atomic weights : P= 31, F= 19,

molar mass of = 1 atomic weight of P+ 5 atomic weight of

 F= 31+5 \times 19

= 31+95

 =126 g/mole

moles in 39.5 gm of

= \frac{Mass}{Molar mass}

 = \frac{39.5}{126}moles

 =0.3134 moles

1 mole of any substance contains

0.3131 moles contains 0.3134  

 = 1.9 \times 10^{23} molecules

Therefore, 1.9 \times 10^{23} molecules of PF_5 are found in 39.5 grams of PF_5.

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