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zvonat [6]
3 years ago
12

PLEASE HELP!! PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP’

Chemistry
2 answers:
ahrayia [7]3 years ago
8 0

Answer:

B is the answer because it doesn't matches the num of valence electrons

AlekseyPX3 years ago
5 0

Answer:

No, because it doesn't match the total number of valence electrons.

Explanation:

The total valence electrons should be 10. But if you add all the valence electrons it gives you 12

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You have a raw egg you put it in a hot pan boom cooked egg most chemical changes are nonreversibal <span />
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Calculate the mass in 4.05*10^22 molecules of calcium phosphate
Marizza181 [45]

Answer:

m = 20.9 g.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to solve this problem by recalling both the Avogadro's number for the calculation of the moles in the given molecules of calcium phosphate and the molar mass of this compound in order to secondly calculate the mass as shown on the following setup:

m=4.05x10^{22}molecules*\frac{1mol}{6.022x10^{23}}*\frac{310.18g}{1mol}\\\\m=20.9g

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8 0
2 years ago
Which atom would form a cation?<br> F<br> Na<br> N<br> P
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5 0
3 years ago
What is the value of Kw at 25°C?<br> 1.0 x 10–14 <br> 1.0 x 10–7<br> 1<br> 7<br> 14
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3 0
3 years ago
Read 2 more answers
A compound is composed of 13% carbon, 4.3% hydrogen, 30.4% nitrogen, and 52.2% oxygen. The mystery compound has a molar mass of
vredina [299]

Answer:

C₂H₈N₄O₆ is the molecular formula for the compound

Explanation:

Data from the problem:

13 g of C in 100 g of compound

4.3 g of H in 100 g of compound

30.4 g of N in 100 g of compound

52.2 g of O in 100 g of compound

Firstly we determine, the mass of each in 184 g of compound, which is 1 mol

(13 g / 100 g) . 184 g  = 24 g C

(4.3 g  / 100 g) . 184 g  = 7.91 g H ≅ 8 g H

(30.4 g / 100 g) . 184 g  = 56 g N

(52.2 g  / 100 g) . 184 g  = 96 g O

And now, we divide the mass by the molar mass of each to determine the moles:

24 g C / 12 g/mol = 2 mol C

8g H / 1 g/mol = 8 mol H

56 g N / 14 g/mol = 4 mol N

96 g O / 16 g/mol = 6 mol O

So the molecular formula of the compound is C₂H₈N₄O₆

8 0
3 years ago
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