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vekshin1
3 years ago
6

A(n) blank is an abbreviation for the name of an element a and usually has either one or two letters

Chemistry
2 answers:
Nesterboy [21]3 years ago
7 0
An chemical symbol is an abbreviation for the name of an element and usually had either one or 2 letters.
mash [69]3 years ago
3 0

Answer:

<h2>Chemical symbol.</h2>

Explanation:

A chemical symbol is a notation composed by one or two letter and refers the abbreviation of a chemical element. The three letter based symbols are the temporary elements.

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How many moles of water, H2O, contain 2.0×1022 molecules of water? (See the hints for assistance in interpreting scientific nota
hammer [34]
You have to use Avogadro's number which is 6.02x10^23.  The units of Avogadro's number is molecules/mole so you divide the number of molecules by Avogadro's number which will give you the number of moles.
(2.0x10^22 molecules)/(6.02x10^23 molecules/mole)=0.033 moles
5 0
4 years ago
How many moles are in 3.45 g of Na2O?Round your answer to three significant
Neporo4naja [7]

Answer: There are 0.056 moles present in 3.45 g of Na_{2}O.

Explanation:

Given : Mass = 3.45 g

Moles is the mass of substance divided by its molar mass.

Hence, moles of Na_{2}O (molar mass = 61.98 g/mol) is as follows.

Moles = \frac{mass}{molar mass}\\= \frac{3.45 g}{61.98 g/mol}\\= 0.056 mol

Thus, we can conclude that there are 0.056 moles present in 3.45 g of Na_{2}O.

6 0
3 years ago
Which of the following circumstances will result in a reaction that is spontaneous at all temperatures?
sladkih [1.3K]
Negative enthalpy change and positive entropy change. I am sure that's the answer!
4 0
4 years ago
Read 2 more answers
A sample that contains aluminum is reacted with sulfuric acid according to the equation given below. When the aluminum dissolves
GrogVix [38]

Answer:

m_{H_2}=0.0574gH_2

Explanation:

Hello,

In this case, the information about the pressure, volume and temperature are enough to compute the mass of hydrogen assuming its ideal behavior:

n_{H_2}=\frac{PV}{RT}=\frac{739mmHg*\frac{1atm}{760mmHg}*0.722 L}{0.082 \frac{atm*L}{mol*K}*298.15K} =0.0287molH_2

The mass is:

m_{H_2}=0.0287molH_2*\frac{2gH_2}{1molH_2} \\m_{H_2}=0.0574gH_2

Best regards.

5 0
3 years ago
SI units are the modern form of ?
timurjin [86]
International System of unites.
7 0
3 years ago
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