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Alex Ar [27]
3 years ago
15

Which sample contains the same number of atoms as a gram-atomic mass of He?

Chemistry
1 answer:
JulijaS [17]3 years ago
4 0

Answer: 2. 7g of Li

Explanation: A mole of any substance contains the same number of particles (Avogadro's number, 6.02*10^23). 1 gram atomic mass of He (4g) is equivalent to 1 mole; so is 1 gram atomic mass (7g) of Li

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Because uranium-235 isn't found naturally in large quantities, engineers increase its concentration in nuclear fuel so that a ch
Vitek1552 [10]
Nuclear Fusion. 

Having low atomic nuclei is the reason why uranium-235 is not commonly found in large nuclear reactions. 

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3 years ago
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aev [14]

Answer:

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3 years ago
You are given the following information: mass = 48 g; volume=24 cm. What is the density of this substance?
GaryK [48]

Answer:

Density = 0.0035 g/cm³

Explanation:

The density equation looks like this:

Density (g/cm³) = mass (g) / volume (cm³)

You have been given both the mass and volume. However, the given volume is not in the correct units. To convert cm to cm³, you should simply raise the given volume to the power of 3.

24 cm  =  (24 cm)³  =  24³cm³  =  13,834 cm³

Now, you can plug you mass and volume into the equation and solve for density. The final answer should have 2 sig figs to reflect the given values.

Density = mass / volume

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6 0
2 years ago
What is the change in internal energy ( ΔU ) of the system if q = –8 kJ and w = –1 kJ for a certain process?
Radda [10]

Answer:

Change in internal energy (ΔU) = -9 KJ

Explanation:

Given:

q = –8 kJ [Heat removed]

w = –1 kJ [Work done]

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Computation:

Change in internal energy (ΔU) = q + w

Change in internal energy (ΔU) = -8 KJ + (-1 KJ)

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Change in internal energy (ΔU) = -9 KJ

6 0
4 years ago
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Nataliya [291]
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= 1.36g
no. of moles of C = 1.36 * 12.0 = 16.3 moles
5 0
3 years ago
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