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bixtya [17]
3 years ago
6

Help please. The combustion of pentane, C5H12, occurs via the reaction

Chemistry
1 answer:
masya89 [10]3 years ago
4 0
If I were you, I'd try to go with this one :[(6)(-241.8)+(5)(-393.5)]-[-35.1] =-481.6. I think that is a solution you have to find. Just use the sum of standard enthalpies of products and  <span>of reactants. Hope you will find it helpful!</span>
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what is the molarity of 20.0 ml of a KCl solution that reacts completely with 30.0 ml of a 0.400 M Pb(NO3)2 solution?
Alex17521 [72]

Answer:

[KCl] = 1.2 M

Explanation:

We need to complete the reaction:

2KCl(aq) + Pb(NO₃)₂(aq)  → 2KNO₃(aq) + PbCl₂(s)↓

By stoichiomety we know that 1 mol of chloride needs 1 mol of nitrate to react:

Let's find out the moles of nitrate, we have:

Molarity = mol/volume(L)

We convert the volume → 30 mL . 1L/1000mL = 0.030L

Molarity . volume(L) = moles → 0.400 M . 0.030L = 0.012 moles

Therefore, we can make a rule of three.

1 mol of nitrate reacts with 2 moles of chloride

Then, 0.012 moles of nitrate must react with (0.012 . 2) / 1 = 0.024 moles of KCl

We convert the volume from mL to L → 20 mL . 1L /1000mL = 0.020L

Molarity = mol /volume(L) → 0.024 mol /0.020L = 1.2 M

7 0
3 years ago
What is the density of ice
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5 0
3 years ago
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What is the name of the molecule below?
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Answer:

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Explanation:

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Explanation:

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