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densk [106]
3 years ago
8

Assume you have 60 micrograms (1 microgram = 10-6 gram) of pure u-238. how many nuclei n0 is this? (recall avogadro's number equ

als 6.022×1023 particles per mole.)
Chemistry
1 answer:
oee [108]3 years ago
5 0
Atomic mass of Uranium is 238.

Hence, 1 mole = 238 g of Uranium will have 6.022×10^23 of Uranium nuclei.

∴, 60 X 10^-6 g of Uranium will have \frac{6.022X10^2^3X60X10^-^6}{238} = 1.518 X 10^17 nuclei of Uranium.
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Answer:

Q = -33.6kcal .

Explanation:

Hello there!

In this case, according to the equation for the calculation of the total heat of reaction when a fixed mass of a fuel like ethane is burnt, we can write:

Q=n*\Delta _cH

Whereas n stands for the moles and the other term for the enthalpy of combustion. Thus, for the required total heat of reaction, we first compute the moles of ethane in 3 g as shown below:

n=3g*\frac{1mol}{30.08g}=0.1mol

Next, we understand that -337.0kcal is the heat released by the combustion of 1 mole of ethane, therefore, to compute Q, we proceed as follows:

Q=0.1mol*-337.0\frac{kcal}{mol}\\\\Q=-33.6kcal

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