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Dmitrij [34]
3 years ago
6

Pls can someone help me

Chemistry
2 answers:
Fittoniya [83]3 years ago
6 0
I’m not 100% sure but i think it might be b
BaLLatris [955]3 years ago
3 0

Answer:

Explanation:

B

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Which of the following represents the least number of molecues?
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Answer:

Answer: a) 20g of H2O (18.02 g/mol) molecules=6.68x10^23

Explanation:

In order to find the amount of molecules of each of the options, we need to follow the following equation.

molecules=\frac{mass(g)x6.022x10^{23}(molecules/mol) }{atomic weight(g/mol)}

So, let´s get the number of molecules for each of the options.

a) molecules=\frac{20(g)x6.022x10^{23}(molecules/mol) }{18.02(g/mol)}=6.68x10^{23}molecules

b) molecules=\frac{77(g)x6.022x10^{23}(molecules/mol) }{16.06(g/mol)}=2.89x10^{24}molecules

c) molecules=\frac{68(g)x6.022x10^{23}(molecules/mol) }{42.09(g/mol)}=9.73x10^{23}molecules

d) molecules=\frac{100(g)x6.022x10^{23}(molecules/mol) }{44.02(g/mol)}=1.37x10^{24}molecules

d) molecules=\frac{84(g)x6.022x10^{23}(molecules/mol) }{20.01(g/mol)}=2.53x10^{24}molecules

the smalest number is in option a)

Best of luck.

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Sandy puts a paper clip on the table. Then, she puts a magnet near the paperclip. The paperclip begins to move.
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A weighed piece of magnesium ribbon is added to a dried crucible, which is reweighed and heated in air to form the compound MgO.
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One of the errors for low percentage of magnesium could be because not all the magnesium may have reacted.

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In order to develop ideas for a new tennis racket, a design team visits three different sporting goods stores. What part of the
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