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Ymorist [56]
3 years ago
15

Which scientist was a great influence to others when he developed the heliocentric model about how the planets orbited the Sun?

Chemistry
1 answer:
exis [7]3 years ago
8 0
It was'nt until the 16th century that a geometric mathematical model of heliocentric system was presented <span> by a Renaissance mathematician, astronomer, </span><span>Nicolaus Copernicus

</span>Nicolaus Copernicus <span>leading to the Copernican Revolution
</span>
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How many milligrams of MgI2 must be added to 257.7 mL of 0.087 M KI to produce a solution with [I−] = 0.1000 M?
lbvjy [14]

Answer:

The answer is 465.6 mg of MgI₂ to be added.

Explanation:

We find the mole of ion I⁻ in the final solution

C = n/V -> n = C x V = 0.2577 (L) x 0.1 (mol/L) = 0.02577 mol

But in the initial solution, there was 0.087 M KI, which can be converted into mole same as above calculation, equal to 0.02242 mol.

So we need to add an addition amount of 0.02577 - 0.02242 = 0.00335 mol of I⁻. But each molecule of MgI₂ yields two ions of I⁻, so we need to divide 0.00335 by 2 to find the mole of MgI₂, which then is 0.001675 mol.

Hence, the weight of MgI₂ must be added is

Weight of MgI₂ = 0.001675 mol x 278 g/mol = 0.4656 g = 465.6 mg

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3 years ago
Please help... I am begging...
iVinArrow [24]

Answer:

The number, such as 98.7 FM, of a radio station represents:

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I don't know how 5°C cooled to 85°C but the answer would be 12.878L

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