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Free_Kalibri [48]
3 years ago
7

What is the mass in grams of 9.76 × 1012 atoms of naturally occurring beryllium?

Chemistry
2 answers:
Ksivusya [100]3 years ago
8 0

The atomic mass of beryllium (Be) is 9 g/mole

Now, 1 mole of any substance contains avogadro's number of that substance. Therefore:

1 mole of Be contains 6.023  10^23 atoms of Be

In other words:

9 grams of Be contains 6.023*10^23 atoms of Be

Therefore, the mass corresponding to 9.76 * 10^12 atoms of Be is:

= 9 g * 9.76 10^12 atoms/6.023*10^23 atoms

= 1.458 * 10^-10 g (or) 1.46 * 10^-10 g


Reika [66]3 years ago
6 0

<u>Answer:</u> The mass of given number of atoms of beryllium is 1.46\times 10^{-10}g

<u>Explanation:</u>

Beryllium is the 4th element of the periodic table.

We know that:

Molar mass of beryllium = 9 g/mol

We are given:

Number of beryllium atoms = 9.76\times 10^{12}

According to mole concept:

6.022\times 10^{23} number of molecules occupy 1 mole of a gas.

As, 6.022\times 10^{23} number of beryllium atoms has a mass of 9 grams.

So, 9.76\times 10^{12} atoms of beryllium will have a mass of = \frac{9g}{6.022\times 10^{23}}\times 9.76\times 10^{12}=1.46\times 10^{-10}g

Hence, the mass of given number of atoms of beryllium is 1.46\times 10^{-10}g

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mixas84 [53]

Answer:

B The water at the bottom of the lake will never freeze

Explanation:

Its simple

5 0
3 years ago
If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy __________ L at STP.
Vlad [161]

If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

<h3>How to calculate volume?</h3>

The volume of a gas at STP can be calculated using the direct proportion method.

According to this question, 50.75 g of a gas occupies 10.0 L at STP, then 129.3g of the same gas will occupy the following:

= 129.3 × 10/50.75

= 25.48L

Therefore, if 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

Learn more about volume at: brainly.com/question/12357202

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6 0
2 years ago
In the following reaction, how many moles of CO2 will form if 10 moles of C3H4 are reacted? How many moles of O2 will also be co
umka2103 [35]

Answer:

40 moles of O₂

30 moles of CO₂

Explanation:

Given parameters:

Number of moles of C₃H₄  = 10moles

Unknown:

Number of moles of CO₂ = ?

Solution:

The number of moles helps to understand and make quantitative measurements involving chemical reactions.

We start by solving this sort of problem by ensuring that the given equation is properly balanced;

        C₃H₄    +      4O₂    →     3CO₂     +      2H₂O

We can clearly see that all the atoms are conserved.

Now, we work from the known to unknown. We know the number of moles of  C₃H₄ to be 10moles;

             1 mole of  C₃H₄ reacted with 4 moles of O₂

              10 moles of C₃H₄ will react with 10 x 4 = 40moles of O₂

      1 mole of  C₃H₄ will produce 3 moles of CO₂

       10 moles of C₃H₄ will produce 10 x 3 = 30moles of CO₂

   

4 0
3 years ago
What is the atomic mass number of an isotope that has an atomic number of 5 and includes 6 neutrons?
irinina [24]

The answer should be; 11

The atomic mass number is found by combining the number of protons and neutrons

Hope this helps :)

8 0
3 years ago
Read 2 more answers
hi, can you check if my answers are correct? I'm not so confident in this topic (topic: Classifying Types of Chemical Reactions)
NikAS [45]
I am pretty sure your answer are correct , from what I know. Good job!
7 0
3 years ago
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