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makkiz [27]
3 years ago
8

Can someone answer 2 for me please?

Chemistry
2 answers:
KIM [24]3 years ago
6 0

Answer: the answer is B it remains constant

Explanation:

The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

harkovskaia [24]3 years ago
5 0

Answer:

i think its b but i could be wrong

Explanation:

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During an endothermic phase change, what happens to the potential energy and the kinetic energy?
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Read 2 more answers
How many atoms of iodine are in 12.75g of CaI2? Hint. How many Iodines are there in one CaI2 particle?
xenn [34]

Answer:

5.225x10^{22}atoms\ I

Explanation:

Hello!

In this case, since 12.75 g of calcium iodide has the following number of moles (molar mass = 293.89 g/mol):

n_{CaI_2}=12.75gCaI_2*\frac{1molCaI_2}{293.89gCaI_2}=0.0434molCaI_2

In such a way, since 1 mole of calcium iodide contains 2 moles of atoms of iodine, and one mole of atoms of iodine contains 6.022x10²³ atoms (Avogadro's number), we compute the resulting atoms as shown below:

atoms\ I=0.0434molCaI_2*\frac{2molI}{1molCaI_2} *\frac{6.022x10^{23}atoms\ I}{1molI} \\\\atoms\ I = 5.225x10^{22}atoms\ I

Best regards!

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3 years ago
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