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IceJOKER [234]
3 years ago
9

Main group elemants are arranged in _______ groups

Chemistry
1 answer:
Lorico [155]3 years ago
3 0

Answer: susuus

hdhjhd

Explanation: sjsjsj

shshsh

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A student obtains a mixture of the chlorides of two unknown metals, X and Z. The percent by mass of X and the percent by mass of
Aleksandr-060686 [28]

<u>Answer:</u> The additional information that is helpful in calculating the mole percent of XCl(s) and ZCl(s) is the molar masses of Z and X

<u>Explanation:</u>

To calculate the mole percent of a substance, we use the equation:

\text{Mole percent of a substance}=\frac{\text{Moles of a substance}}{\text{Total moles}}\times 100

Mass percent means that the mass of a substance is present in 100 grams of mixture

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

We require the molar masses of Z and X to calculate the mole percent of Z and X respectively

Hence, the additional information that is helpful in calculating the mole percent of XCl(s) and ZCl(s) is the molar masses of Z and X

8 0
3 years ago
Calculate the entropy change for the reaction: Fe2O3(s) +3C(s) -&gt; 2Fe(s) + 3CO(g)
Gelneren [198K]

Answer:

ΔS = +541.3Jmol⁻¹K⁻¹

Explanation:

Given parameters:

Standard Entropy of Fe₂O₃ = 90Jmol⁻¹K⁻¹

Standard Entropy of C = 5.7Jmol⁻¹K⁻¹

Standard Entropy of Fe = 27.2Jmol⁻¹K⁻¹

Standard Entropy of CO = 198Jmol⁻¹K⁻¹

To find the entropy change of the reaction, we first write a balanced reaction equation:

                              Fe₂O₃ +  3C →  2Fe + 3CO

To calculate the entropy change of the reaction we simply use the equation below:

      ΔS = ∑S_{products} - ∑S_{reactants}

Therefore:

     ΔS = [(2x27.2) + (3x198)] - [(90) + (3x5.7)] = 648.4 - 107.1

                          ΔS = +541.3Jmol⁻¹K⁻¹

5 0
3 years ago
Which scientists contributed to the current model of the atom? And what was their contribution?
Lina20 [59]
<span>Binuk, Drew, Henry, Liz Scientists who contributed in the Atomic Theory Robert Andrews Millikan James Chadwick Used an oil-drop experiment to measure the charge of the electron, allowing them then to be able to calculate the mass of the electron.</span>

4 0
3 years ago
Some one please help me ​
Norma-Jean [14]

Answer:

C.4

Explanation:

6 0
3 years ago
I'm boaaaaaaaaaaaaaaard yall like entertain me lol jkjkj
vazorg [7]

^{hello}.

Sorry, I'm am not going to entertain you!

But, have a great day!

#LearnWithBrainly

- Answer

TanakaBro

Plus, here is a anime image that might make your day happy. . .

7 0
3 years ago
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