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tiny-mole [99]
3 years ago
13

an unknown element has an atomic number of 6 and an atomic mass of 13 .based on this information what is the identity of this un

known element
Chemistry
1 answer:
makkiz [27]3 years ago
8 0
So if you look through the periodic table you can see that the element is Carbon(symbol C)
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What is the mass of 1.5 moles of CO2?
Arisa [49]
1 mole of CO2 has 44g
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8 0
3 years ago
A horizontal pipe 15 cm in diameter and 4 m long is buried in the earth at a depth of 20 cm. The pipe-wall temperature is 75 deg
Basile [38]

Explanation:

The given data for case (1) is as follows.

  h = 20 cm = 0.2 m

Assuming that a rectangular slab is placed above the pipe and we will calculate the heat transfer as follows.

              Q = kA \frac{\Delta T}{L}

  where,    A = area

                  L = length

                  k = thermal conductivity = 0.8 W/m

             \Delta T = change in temperature.

Therefore, putting the given values into the above formula as follows.

            Q = kA \frac{\Delta T}{L}

                = 0.8 W/m \times (4 m \times 0.15 m) \frac{75 - 5}{0.2}

                = 168 W

For case (2), h = 180 cm = 1.8 m

Therefore, heat lost will be calculated as follows.

                       Q = kA \frac{\Delta T}{L}

                           = 0.8 W/m \times (4 m \times 0.15 m) \frac{75 - 5}{1.8}

                           = 18.67 W

Thus, we can conclude that 18.67 W heat lost if the pipe was buried at a depth of 180 cm.

8 0
3 years ago
I really need help who ever has the time and skills plzzz help me
Volgvan
Xmzmmsmkxkekxkkskfkxkskxkks
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Explanation:

conduction involves the transfer of molecules due to the movement of particles

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Perform the following operation
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Answer:

(5.4 x 10³) x (1.2 x 10⁷) = 6.48 x 10¹⁰

With correct significant figures, the answer would be 6.5 x 10¹⁰.

4 0
2 years ago
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