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2 years ago

5

Escaping from the haunted house, Anna ran home immediately to her chemistry lab

1 answer:

nevsk [136]2 years ago

6 0

89.1% Au

The molar mass of Au2O3 is 2(196.97) + 3(16.00) = 441.94 g/mol
The mass percent of Au is therefore 2(196.97) / 441.94, which is 393.94/441.94 = 0.891 —> 89.1%

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Answer: 5000

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2 years ago

What volume of lead (of density 11.3 g/cm3 ) has the same mass as 395 cm3 of a piece of redwood (of density 0.38 g/cm3 )? Answer

Zepler [3.9K]

$d_{1}=\frac{m}{V_{1}}\\\\
V_{1}=395cm^{3}\\
d_{1}=0,38\frac{g}{cm^{3}} \ \ \ \ \Rightarrow \ \ \ \ m=395cm^{3}*0,38\frac{g}{cm^{3}}=150,1g\\\\\\
d_{2}=\frac{m}{V_{2}}\\\\
m=150,1g\\
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3 years ago

Question :What's oxidation?<br>

professor190 [17]

Answer:

The process or result of oxidizing or being oxidized.(Rust)

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2 years ago

As the elements are considered from left to right in period 4 which is the correct sequencing of the elements?

velikii [3]

https://quizlet.com/17797282/periodicity-review-flash-cards/

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3 years ago

Two protons and two neutrons are released as a result of this reaction.

Murljashka [212]

<u>Answer:</u> The particle released in the given reaction is one alpha particle

<u>Explanation:</u>

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fission reaction:

$^{222}_{86}\textrm{Rn}\rightarrow ^A_Z\textrm{X}+^{218}_{84}\textrm{Po}$

<u>To calculate A:</u>

Total mass on reactant side = total mass on product side

222 = A + 218

A = 4

<u>To calculate Z:</u>

Total atomic number on reactant side = total atomic number on product side

86 = Z + 84

Z = 2

The isotopic symbol of unknown element is $_{2}^{4}\textrm{He}$ . Another name of helium atom is alpha particle.

Hence, the particle released in the given reaction is one alpha particle

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3 years ago

Read 2 more answers