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Ipatiy [6.2K]
3 years ago
11

A 12.41 g sample of nabr contains 22.34% na by mass. considering the law of constant composition (definite proportions) how many

grams of sodium does a 8.99 g sample of sodium bromide contain?
Chemistry
2 answers:
scZoUnD [109]3 years ago
7 0

Answer:

m_{Na}=2.01g

Explanation:

Hello,

In this case, given the by mass percent of sodium in sodium bromide::

\% Na=\frac{m_{Na}}{m_{NaBr}}*100\%=22.34  \%

Solving for the mass of sodium, considering the constant composition of sodium in the sodium bromide, we obtain:

m_{Na}=\frac{\% Na*m_{NaBr}}{100\%} =\frac{22.34\%*8.99g}{100\%} \\\\m_{Na}=2.01g

Best regards.

Helga [31]3 years ago
6 0
I'm assuming you mean how many grams of sodium does 8.99 grams of sodium bromide have, because Bromine would not have any sodium in it.

Then, just direct calculate 22.34
(22.34 \div 100) \times 8.99 = 2.008366
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The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quantum numbers.
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Answer:

See explanation

Explanation:

We can describe electrons using four sets of quantum numbers;

principal quantum number (n)

orbital quantum number (l)

magnetic quantum number (ml)

spin quantum number (ms)

Since no two electrons in an atom can have the same value for all four quantum numbers according to Pauli exclusion theory, for the orbitals given one possible value for each quantum number is shown below;

For 1s-

n = 1, l= 0, ml = 0, ms= 1/2

For 2s-

n= 2, l =0, ml=0, ms=1/2

For 1s and 2s orbitals, there is only one possible value for ml which is zero.

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3 years ago
How many reactant molecules and product gas molecules are in this equation?
Mice21 [21]

Answer:

N₂  = 6.022 × 10²³ molecules

H₂ = 18.066 × 10²³ molecules

NH₃ = 12.044 × 10²³ molecules

Explanation:

Chemical equation;

N₂ + 3H₂     →  2NH₃

It can be seen that there are one mole of nitrogen three mole of hydrogen and two moles of ammonia are present in this equation. The number of molecules of reactant and product would be calculated by using Avogadro number.

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

Number of molecules of nitrogen gas:

1 mol = 6.022 × 10²³ molecules

Number of molecules of hydrogen:

3 mol × 6.022 × 10²³ molecules/ 1 mol

18.066 × 10²³ molecules

Number of molecules of ammonia:

2 mol × 6.022 × 10²³ molecules/ 1 mol

12.044 × 10²³ molecules

6 0
4 years ago
Which of the following describes a chemical property of oxygen
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Which of the following describes a chemical property of oxygen

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For the following SN1 solvolysis reaction, select the correct rate equation and the overall reaction order (note: CH3OH is the s
sineoko [7]

Answer:

Explanation:

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3 years ago
A material has an ASTM grain size number of 7. Determine the magnification, if the number of grains per square inch observed is:
Luden [163]

Answer:

A) M = 100X

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C) M = 178.88X

Explanation:

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we know that number of grain per square inch is given as

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therefore we have

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B)  total grain per inch^2 = 500 grain/inch^2

we know that number of grain per square inch is given as

Nm = 2^{n-1} (\frac{100}{M})^2

where M is magnification, n is grain size

therefore we have500 = 2^{7-1}(\frac{100}{M})^2

solving for M we get

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C) Total grain per inch^2 = 20 grain/inch^2

we know that number of grain per square inch is given as

Nm = 2^{n-1} (\frac{100}{M})^2

where M is magnification, n is grain size

therefore we have20 = 2^{7-1}(\frac{100}{M})^2

solving for M we get

M = 178.88 X

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