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DedPeter [7]
3 years ago
15

Andrew and Jeffrey walk together. When Andrew walks 3

Chemistry
1 answer:
atroni [7]3 years ago
4 0

Answer: 250 steps

Explanation:

The data we were given;

When Andrew walks 3 steps; Jeffrey walks 5 steps to catch up

That's is to say

Andrew's 3 steps = Jeffrey's 5 steps

Now Andrew's 150 steps = Jeffrey's X steps

So we have to find the number of steps (X) Jeffrey would have to take to catch up with Andrew.

3 = 5

150 = X

3X = 150 × 5

X = (150 × 5) / 3

X = 750 / 3

X = 250

Therefore Jeffrey would need 250 steps to catch up with Andrew.

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A reaction is occurring in a test tube. How is heat transmitted to the surroundings?
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It should be noted that when a  reaction is occurring in a test tube, heat transmitted to the surroundings when Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.

<h3>What is heat?</h3>

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If the container is closed and the ethanol is allowed to reach equilibrium with its vapor, how many grams of liquid ethanol rema
SVETLANKA909090 [29]

Explanation:

Let us assume that the given data is as follows.

        V = 3.10 L,        T = 19^{o}C = (19 + 273)K = 292 K

       P = 40 torr    (1 atm = 760 torr)

So,     P = \frac{40 torr}{760 torr} \times 1 atm

             = 0.053 atm

          n = ?

According to the ideal gas equation, PV = nRT.

Putting the given values into the above equation to calculate the value of n as follows.

                 PV = nRT

   0.053 atm \times 3.10 L = n \times 0.0821 L atm/mol K \times 292 K

                 0.1643 = n \times 23.97

                    n = 6.85 \times 10^{-3}

It is known that molar mass of ethanol is 46 g/mol. Hence, calculate its mass as follows.

               No. of moles = \frac{mass}{\text{molar mass}}

                 6.85 \times 10^{-3} = \frac{mass}{46 g/mol}  

                    mass = 315.1 \times 10^{-3} g

                              = 0.315 g

Thus, we can conclude that the mass of liquid ethanol is 0.315 g.

4 0
3 years ago
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