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4 years ago

What are the different elements found in naphthalene and how many atoms of each are found in the formula. C10H8

1 answer:

8 0

Calculating the molar mass of naphthalene (C10H8)

molar mass = 10 x (12.01) + 8(1.008)

= 120.1 + 8.064 = 128.164 g/mol

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A 2.5-liter sample of a gas has 0.30 mole of the gas. If 0.15 mole of the gas is added, what is the final volume of the gas? Tem

enot [183]

Answer:

1.125

Explanation:

I think it is his because if you add 0.30 and 0.15 it adds up to 0.45 so you just multiply 0.45 and 2.5 and then it gives you 1.125. HOPE IT HELPS.

4 0

3 years ago

The mass of a piece of iron is 39 g and its volume is 5 cm. What is its

klio [65]

Answer:

Explanation:

Divide the mass by the volume.

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3 years ago

How many joules of heat are absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100

Lilit [14]

The temp would be 37.0c

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3 years ago

A chemist prepares a solution of iron(III) bromide by measuring out of iron(III) bromide into a volumetric flask and filling the

ANTONII [103]

The question is incomplete, here is the complete question:

A chemist prepares a solution of iron (III) bromide $(FeBr_3)$ by measuring out 2.78 g of iron (III) bromide into a 50. mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in mmol/L of the chemists iron (III) bromide solution. Be sure your answer has the correct number of significant digits.

<u>Answer:</u> The concentration of iron(III) bromide solution is 0.19 M

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Given mass of iron(III) bromide = 2.78 g

Molar mass of iron(III) bromide = 298.6 g/mol

Volume of solution = 50. mL

Putting values in above equation, we get:

$\text{Molarity of solution}=\frac{2.78\times 1000}{298.6\times 50}\\\\\text{Molarity of solution}=0.19M$

Hence, the concentration of iron(III) bromide solution is 0.19 M

5 0

3 years ago

During an experiment, Jasmine observes light being produced from mixing 2 substances in a beaker. What does this evidence sugges

Lubov Fominskaja [6]

Answer: C. A Chemical Change

Explanation:

A chemical change is one that occurs when new substances are produced preceding a chemical reaction ( the mixing or combination of one substance with another).

From the experiment by Jasmine, since light was produced from the mixture, energy is being released which is due to a chemical change.

4 0

3 years ago