It takes 48 minutes for 7 people to paint 7 walls.How many minutes does it take 20 people to paint 20 walks?

Chemistry

1 answer:

AVprozaik [17]3 years ago

5 0

Explanation:

It will always take 48 minutes. Even if it was one thousand people to paint one thousand walls.

The point here is that it takes 48 minutes for one person to paint one wall. As long as the number of people is the same as the number of walls, it will always take 48 minutes.

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Use the equation to answer the question

vaieri [72.5K]

CH4 + 2O2→CO2 + 2H2O

Explanation:

CH4 + O2→CO2 + H2O

First look at the C atoms. At first glance they are balanced with 1 C on each side.

Now look at the H atoms. They are not balanced. There are 4 H atoms on the left side and 2 H atoms on the right. Place a coefficient of 2 in front of the H2O. We now have 4 H atoms on both sides.

CH4 + O2→CO2 + 2H2O

Now look at the O atoms. They are not balanced. There are 2 O atoms on the left side and 4 on the right. Place a coefficient of 2 in front of the O2. We now have 4 O atoms on both sides.

CH4 + 2O2→CO2 + 2H2O

The equation is now balanced. Each side has 1 C atom, 4 H atoms, and 4 O atoms.

6 0

3 years ago

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At equilibrium, a 1.00 M OCl− solution has an [OH−] of 5.75 × 10−4 M. Which of the following is the correct pH of the solution?

sveta [45]

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Below is the solution:

pOH = - log (5.75 × 10^−4) = 3.24
pH = 14 - 3.24 = 10.76

6 0

3 years ago

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A throat spray is 1.40% by mass Phenol, C6H5OH in water. If the solution has a density of 0.9956 g/ml, calculate the molarity of

myrzilka [38]

Answer: The molarity of solution is 1.08 M

Explanation:

We are given:

(m/m) of phenol = 1.40 %

This means that 1.40 g of phenol is present in 100 g of solution.

To calculate volume of solution, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$