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nasty-shy [4]
3 years ago
9

The symbols given to elements are always directly related to their chemical names

Chemistry
1 answer:
vivado [14]3 years ago
7 0
What’s the question? If you are asking true or false it’s true
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What is the mass of 1.7 × 1023 atoms of zinc (Zn)?
Rudiy27

Number of moles is defined as the ratio of given mass in g to the molar mass.

The mathematical formula is:

Number of moles = \frac{given mass in g}{molar mass}   (1)

Number of zinc atoms is equal to 1.7\times10^{23}, by Avogadro number, number of moles can be calculated.

As, 1 mol=6.022\times10^{23} atoms, hence,

1.7\times10^{23}\times\frac{1 mol}{6.022\times10^{23} }

= 0.2822 mol

Now, from formula (1), calculate mass in g (molar mass of zinc = 65.4 g/mol)

0.2822 mol = \frac{mass in g}{65.4 g/mol}

mass in g  = {0.2822 mol \times 65.4 g/mol

= 18.45588 g

Thus, by rounding off the above number, it will come near about 19 g approximately.

Hence, option (C) is the correct answer.



 



8 0
4 years ago
Which statement about Schrödinger’s theory of the atomic model is true? A. It proved that the nucleus of an atom is positively c
lesya692 [45]
Basically since i have to put at least 20 characthers I'm gonna ramble then give the answer so here ya go: Its C :)
5 0
3 years ago
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What does the prefix hepta mean
ss7ja [257]
The prefix hepta means 7
5 0
4 years ago
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Why does Ca have a lower ionization energy than He <br> ill give u brainliest :)
sleet_krkn [62]

Answer: because he has more protons than ca

Explanation:

7 0
3 years ago
a)Nitrous oxide gas (systematic name: dinitrogen monoxide) is used by some dental practitioners as an anesthetic. Nitrous oxide
Mama L [17]

Explanation:

Nitrous oxide or dinitrogen monoxide can be simple be prepared by the decomposition of ammonium nitrate in the following way -

<u>The reaction is as follows -</u>

NH₄NO₃  ---------------->  N₂O + H₂O

This is the unbalanced reaction as was asked in the question , without mentioning the states of matter .

The reaction is carried out in an anhydrous condition ,since , ammonium nitrate can explode on heating .

6 0
4 years ago
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