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qaws [65]
3 years ago
10

HELP ASAP!!! Why is cobalt (Co) placed before nickel (Ni) on

Chemistry
1 answer:
KatRina [158]3 years ago
7 0
The answer is A or D
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What is the maximum number of electrons in the first electron shell, closest to the nucleus?
Ymorist [56]
The correct answer is B. 2
6 0
3 years ago
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Can someone help me please I will mark you brainliest
lara [203]

1: a, 2:a, 3:a, 4:c, 5:d, 6:d, 7:c;

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3 years ago
How many moles are there in 111.7 g of Fe?
Alenkinab [10]

Answer:

2

Explanation:

55.85 grams per mole.

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111.7

6 0
2 years ago
____H3PO4 + ____ KOH --> ______K3PO4 + ____H2O can someone please balance that chemical equation?
Murrr4er [49]

Answer:

H3PO4 + 3KOH ----> K3PO4 + 3H2O

Explanation:

The valency of K element is + 1 while that of PO4 compound is -3

Hence, at least 3 K atoms are needed to combine with PO4 to form K3PO4 compound.

Hence, the revised equation will be

H3PO4 + 3KOH ----> K3PO4 + 3H2O

Now, the number of atoms and charges of each element is a given equation are equal on both the left and right hand side.

6 0
3 years ago
Use bond energies to determine δhrxn for the reaction between ethane and chlorine. ch3ch3(g)+cl2(g)→ch3ch2cl(g)+hcl(g)
STALIN [3.7K]
For this reaction to proceed, the following bond breaking should occur: 

*one C-H bond
* one Cl-Cl bond

After, the following bond formations should occur:
*one C-Cl bond
*one H-Cl bond

Now, add the bond energies for the respective bond energies which can be found in the attached picture. For bond formations, energy is negative. For bond breaking, energy is positive.

ΔHrxn = (1)(413) + (1)(242) + 1(-328) + 1(-431) = <em>-104 kJ</em>

3 0
3 years ago
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