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4 years ago

What happens ????????

Chemistry

2 answers:

Lemur [1.5K]4 years ago

6 0

The air pressure changes

ivolga24 [154]4 years ago

5 0

Correct me if I wrong but I think it's "c"

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Which of these is an indication that a chemical reaction has occurred?

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D- If there is a color change that is indicative to that being a chemical change.

A, B, and C are examples of physical changes.

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3 years ago

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The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is used to

Igoryamba

Answer:

Probably it was ment to illustrate how significant and indivisible, being very small, atoms are and how each of them under normal conditions of presure and temperature find their own place eventually

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4 years ago

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If reactants A and B contain a total of 248 kJ of chemical energy, and products C and D contain a total of 841 kJ of chemical en

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The answer is endothermic.

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4 years ago

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The normal boiling point of ethanol (C2H5OH) is 78.3 oC and its molar enthalpy of vaporization is 38.56 kJ/mol. What is the chan

Sloan [31]

Answer:

The change in entropy in the system is -231.5 J/K

Explanation:

Step 1: Data given

The normal boiling point of ethanol (C2H5OH) is 78.3 °C = 351.45 K

The molar enthalpy of vaporization of ethanol is 38.56 kJ/mol = 38560 J/mol

Mass of ethanol = 97.2 grams

Pressure = 1 atm

Step 2: Calculate the entropy change of vaporization

The entropy change of vaporization = molar enthalpy of vaporization of ethanol / temperature

The entropy change of vaporization = 38560 J/mol / 351.45 K

The entropy change of vaporization = -109.72 J/k*mol

Step 3: Calculate moles of ethanol

Moles ethanol = mass / molar mass ethanol

Moles ethanol = 97.2 grams / 46.07 g/mol

Moles ethanol = 2.11 moles

Step 4: Calculate change in entropy

For 1 mol = -109.72 J/K*mol

For 2.11 moles = -231.5 J/K

The change in entropy in the system is -231.5 J/K

7 0

3 years ago

What is the molarity of a solution which has a volume of 3 litres and contains 5.1 moles of Br2?

katrin [286]

Answer:

The molarity of the solution is 1.7 $\frac{moles}{liter}$ .

Explanation:

Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$Molarity=\frac{moles of solute}{volume of the solute}$

Molarity is expressed in units $\frac{moles}{liter}$ .

In this case, you know:

moles of solute= 5.1
volume= 3 L

Replacing:

$Molarity=\frac{5.1 moles}{3 L}$

Solving:

Molarity= 1.7 $\frac{moles}{liter}$

The molarity of the solution is 1.7 $\frac{moles}{liter}$ .

4 0

3 years ago