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liberstina [14]
3 years ago
11

77 points to who can answer these all correctly and I will crown Brainiest.

Chemistry
1 answer:
kap26 [50]3 years ago
4 0
Can I send a picture instead of typing it out?
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What mass of Cu(s) is electroplated by running 24.5A of current through a Cu2+(aq)solution for 4.00 h?Express your answer to thr
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Answer: 116 g of copper

Explanation:

Q=I\times t

where Q= quantity of electricity in coloumbs

I = current in amperes = 24.5A

t= time in seconds =  4.00 hr = 4.00\times 3600s=14400s  (1hr=3600s)

Q=24.5A\times 14400s=352800C

Cu^{2+}+2e^-\rightarrow Cu

2\times 96500C=193000C  of electricity deposits 63.5 g of copper.

352800 C of electricity deposits = \frac{63.5}{193000}\times 352800=116g of copper.

Thus 116 g of Cu(s) is electroplated by running 24.5A of current

Thus  remaining in solution = (0.1-0.003)=0.097moles

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3 years ago
Is sodium benzoate soluble in NaOH, NaHCO3
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It is water soluble so is also soluble in aqueous solutions of NaOH or NaHCO3.
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The answer is a) sodium!

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All phosphorus atoms have the same
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A chemist dissolves 1.3 mol NaCl in a 2.0-kg sample of water. What is the boiling point of this solution? (Assume that pure wate
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For this problem, the solution is exhibiting some colligative properties since the solute in the solution interferes with some of the properties of the solvent. We use equation for the boiling point elevation for this problem. We do as follows:
<span>
ΔT(boiling point)  = (Kb)mi
</span>ΔT(boiling point)  = (0.512)(1.3/2.0)(2)
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T(boiling point) = 100 + 0.67 = 100.67 degrees Celsius</span>
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