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3 years ago

A horizontal tube carrying hot water has a surface temperature of 355.4 K and an outside diameter

Chemistry

1 answer:

Alex_Xolod [135]3 years ago

5 0

Answer:

The natural convection heat loss is 185.5 W

Explanation:

The equation for convection heat loss is:

Q/t = k*A*(T1-T2)/d

in which: Q/t is the convection heat loss, k is 0.6 W/mK for water, A is the are of the tube which corresponds to (πd^2)/4. d= 25.4 mm or 0.0254 m. The area is 5.06 m2. The difference in temperature is given by the problem: 355.4 K - 294.3 K. d for the convection heat loss is the thickness of the barrier which is 1 m of the length of the pipe.

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How many iron atoms are in the formula for iron(III) oxide?

velikii [3]

Answer:

There is two iron atoms.

Explanation:

The formula iron oxide is Fe2O3 F e 2 O 3 therefore there would be two. Hope this helps. :)

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3 years ago

Which is NOT part of a normal microscope?<br> a.ocular<br> b. nosepiece<br> c.stage<br> d.objective

Evgesh-ka [11]

Answer:

I believe it is a Nose piece

Explanation:

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3 years ago

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What type of organism does this cell most likely belong to?

maks197457 [2]

Answer:

A) a plant

Explanation:

A plant cell consists of cytoplasm, chloroplast, nucleus, mitochondria, cell wall, and a Golgi apparatus. They represent a eukaryotic cell of green plants and there are various types of plant cells such as Parenchyma, Collenchyma, Sclerenchyma, Xylem, Phloem, and the Epidermis.

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3 years ago

The frequency of an x-ray wave is 3.0 x 1012MHz. Its wave speed is 3.0x 108m/s. Calculate the wavelength of the x-ray wave below

jasenka [17]

Answer: The wavelength of the x-ray wave is $10^{-10}m$

Explanation:

To calculate the wavelength of light, we use the equation:

$\lambda=\frac{c}{\nu}$

where,

$\lambda$ = wavelength of the light = ?

c = speed of x-ray= $3.0\times 10^8m/s$

$\nu$ = frequency of x-ray = $3.0\times 10^{12}MHz=3.0\times 10^{18}Hz= 3.0\times 10^{18}s^{-1}$ $(1Hz=1s^{-1})$

Putting in the values:

$\lambda=\frac{3.0\times 10^8m/s}{3.0\times 10^{18}s^{-1}}=10^{-10}m$

Thus the wavelength of the x-ray wave is $10^{-10}m$

5 0

3 years ago

The molar mass of H2O is 18.01 g/mol. The molar mass of O2 is 32.00 g/mol. What mass of H2O, ins grams, must react to produce 50

Ivan

Answer:

56.28 g

Explanation:

First change the grams of oxygen to moles.

(50.00 g)/(32.00 g/mol) = 1.5625 mol O₂

You have to use stoichiometry for the next part. Looking at the equation, you can see that for every 2 moles of H₂O, 1 mole of O₂ is produced. Convert from moles of O₂ to moles of H₂O using this relation.

(1.5625 mol O₂) × (2 mol H₂O/1 mol O₂) = 3.125 mol H₂O

Now convert moles of H₂O to grams.

(3.125 mol) × (18.01 g/mol) = 56.28125 g

Convert to significant figures.

56.28125 ≈ 56.28

5 0

3 years ago