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mafiozo [28]
3 years ago
10

How was your day????????​

Chemistry
2 answers:
Studentka2010 [4]3 years ago
6 0
Great, im school hbu?
Trava [24]3 years ago
3 0

Answer:

I literally just woke up for school hehe

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How many moles of isooctane must be burned to produce 100 kJ of heat under standard state condaitions?
kodGreya [7K]

Answer:

0.018 moles of isooctane must be burned to produce 100 kJ.

Explanation:

When the isooctane is <em>burned</em>, it undergoes a reaction known as combustion, in which reacts with oxygen to produce carbon dioxide and water. In standard conditions (Pressure = 1 atm and Temperature = 298 K) formed water is liquid. The balanced equation is:

C₈H₁₈(l) + 12.5 O₂(g) ⇄ 8 CO₂(g) +  9 H₂O(l)

The standard enthalpy of combustion (which can be found in tables) relates the amount of isooctane that reacts and the heat the reaction liberates. In this case, ΔH°c = -5,460 kJ/mol, that is every 1 mol of isooctane that burns, 5,460 kJ of heat are released.

We can begin with the information of 100 kJ and apply this conversion factor. Since this energy is released, by convention, we write it with a minus sign.

-100kJ.\frac{1mol (isooctane)}{-5,460kJ} =0.018 mol(isooctane)

4 0
3 years ago
One mole of Ca is equal to how many atoms​
Irina18 [472]

Answer:

1 mole of calcium contains 6.023 \times 10^{23} atoms.

Explanation:

1 mole is the amount of a substance that contains exactly 6.023\times 10^{23} constituent particles. 1 mole of a substance is always equal to the atomic mass of the element.

Hence, 1 mole of calcium will also have 6.023\times 10^{23} atoms.

Number of atoms in 1 mole calcium = 6.023 \times 10^{23} atom

4 0
3 years ago
The mass of an object is 205 gram while the volume was measured to be 82.5 mL. What is this object's density?
aniked [119]

2.48 g/mL

Density = mass/volume = (205 g)/(82.5 mL) = 2.48 g/mL

5 0
3 years ago
How are elements symbols represented on the periodic table
oksano4ka [1.4K]

Hiya!!

Your answer is 118

Hope this helps!


5 0
3 years ago
What is a base used in toothpaste?
goldenfox [79]

Answer: Option:C

Explanation:

6 0
3 years ago
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