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leonid [27]
3 years ago
6

Please help. thanks :)

Chemistry
2 answers:
Anastasy [175]3 years ago
7 0

Answer:

2H_{2}+O_{2}  ⇒  2H_{2}O is balanced.

Explanation:

  • In the first equation number of oxygen is not balanced
  • In the second equation number of hydrogen is not balanced
  • In the third equation one oxygen is extra in RHS
  • The fourth equation is the balanced one.

sleet_krkn [62]3 years ago
6 0

The correct answer would be equation 4, because there are 4 Hydrogens and 2 Oxygens on each side of the equation making it balanced.

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Answer:

The rate of evaporation decreases, or slows down

Explanation:

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Calculation: If a compound is 14.40% hydrogen by mass and 85.60% carbon by mass, what is the empirical formula?
IgorLugansk [536]

Answer:

CH2

Explanation:

We are given that a compound is 14.40% hydrogen and 85.60% carbon.

Let the mass of the substance be 100g.

Mass of the hydrogen: 14.40% of 100 = 14.40 g

Mass of the carbon: 85.60% of 100 = 85.60 g

Now, let's find the moles of hydrogen:

14.40 g*\frac{1 mole}{1gH} = 14.40 mole

Moles of carbon:

85.60g*\frac{1 mol}{12gC} = 7.13mol

Let's put these in a ratio and simplify:

7.13 mole C: 14.40 mole H

1 mole C: 2 mole H

Therefore, the empirical formula of this compound is CH2.

Hope this helps!! If you have any questions about my work, please let me know in the comments!

3 0
2 years ago
As
Mars2501 [29]

Explanation:

  1. area of rectangle=l×b
  • 15=5×b
  • b=3cm

2.area of rectangle=l×b

  • 28=l×4
  • l=7cm

3. perimeter of square=4×L

  • 24=4×L
  • L=6cm

4. perimeter of rectangle=2(L+b)

  • 14=2(4+b)
  • 14=8+2b
  • 2b=6
  • b=3cm

hope it helps.

4 0
2 years ago
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country of origin and chemical makeup

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