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r-ruslan [8.4K]
3 years ago
11

Which statement concerning elements is true?

Chemistry
1 answer:
Marina86 [1]3 years ago
7 0
The answer is either number one or two.
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Calculate the number of moles of iodine in 7.68×10^25 molecules of I2
Dmitrij [34]

Answer:

<h2>127.57 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{7.68 \times  {10}^{25} }{6.02 \times  {10}^{23} }   \\  = 127.574750...

We have the final answer as

<h3>127.57 moles</h3>

Hope this helps you

4 0
2 years ago
A student sets up an experiment according to the table below. What question was the student most likely investigating?
user100 [1]

Answer:

88

Explanation:

7 0
3 years ago
What does Ca stand for in chem?
abruzzese [7]

Answer:

Calcium

Explanation:

Periodic table

7 0
3 years ago
Read 2 more answers
Can the excess reactant (in stoichiometry) be negative?
strojnjashka [21]
No. Think about it this way: it’s a physical, leftover substance, you can never have a negative amount of anything.

If you’re speaking in terms of charge, however, then yes, it’s very likely.
6 0
3 years ago
Water and carbon dioxide word equation
Marina86 [1]

Answer:

Carbon iv oxide + water - - carbonic acid

Explanation:

CO2 + H2O--H2CO3 (balanced equation)

5 0
3 years ago
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