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ella [17]
3 years ago
7

What is the answer please help

Chemistry
2 answers:
Wewaii [24]3 years ago
6 0

Answer: C

Explanation:

there should be 2 molecules which leaves A and C. But there should be 1 white circle and 3 black circles which means C is the right answer

Helen [10]3 years ago
5 0
The answer to your question is C
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Which of the following substances best conducts electricity in an aqueous solution? CH3OH
lapo4ka [179]

Answer:

KCI

Explanation:

I took the test

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3 years ago
What is the meaning of "Laser"
iVinArrow [24]
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8 0
3 years ago
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Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) and Ca(OH)2.
Sergio [31]
The answer is -60.57 = -60.6 KJ.
CaC2(s) + 2 H2O(l) ---&gt; Ca(OH)2(s) +C2H2(g) H= -127.2 KJ
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Hf Ca(OH)2 = -986.2
<span>Hf H2O = -285.83
Now,

</span><span>add them up. 226.77 - 986.2 + (2*285.83) = -187.77 
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 -187.77+127.2 = -60.57 </span>
8 0
4 years ago
Read 2 more answers
In the presence of excess oxygen, methane gas burns in a constant-pressure system to yield carbon dioxide and water: CH4 (g) + 2
djyliett [7]

Answer:

-100.125

Explanation:

We are given

          CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l)    △H = -890.0 kJ/mol

The given information is for complete reaction

we have 1.8grams of Methane

Molar mass of CH4 = 16  

No of moles of Methane = 1.8/ 16

                                          = 0.1125

So the amount of the heat will be released from the amount of the methane

Q = No of moles*( -890.0 kJ/mol)

  = 0.1125*(-890)

   = -100.125kJ/mole

Therefore the amount of Energy released from 1.8 grams of methane is equal to -100.125

3 0
3 years ago
How many atoms are in 0.23 moles of calcium?
Alex_Xolod [135]

Answer:

1.385 × 10²³ atoms of calcium

Explanation:

Given data:

Number of moles of calcium = 0.23 mol

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 0.23 mole of calcium:

one mole =  6.022 × 10²³ atoms of calcium

0.23 ×  6.022 × 10²³ atoms of calcium

1.385 × 10²³ atoms of calcium

6 0
4 years ago
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