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Katarina [22]
2 years ago
5

What is the percent CdSO4 by mass in a 1.00 m aqueous CdSO4 solution?

Chemistry
1 answer:
Svet_ta [14]2 years ago
3 0
I don't know but I'm wasting 5 seconds of your time you can't take back sorry
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True or False
Deffense [45]
The answer is true that they have equal mases.


7 0
2 years ago
(ii) Describe another method for making ethanol.​
Aloiza [94]

Answer:

There are essentially three methods used to produce ethanol:

Manufacture from ethene using steam (the "synthetic" route)

Production from sugars and starches by fermentation, using yeasts.

Production from biomass waste, using bacteria.

Please give brainlist if this helped

7 0
2 years ago
How is emission spectra produced?
gulaghasi [49]

Answer:

Atomic emission spectra are produced when excited electrons return to the ground state.

Explanation:

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2 years ago
Read 2 more answers
An element has 8 protons and 8 neutrons in its nucleus and 8 electrons revolving around the nucleus. What is the atomic number a
Molodets [167]
C.

Protons is 8 so the atomic number will be 8.

Number of neutrons= atomic mass - atomic number

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5 0
3 years ago
A rock contains 0.623 mg of 206Pb for every 1.000 mg of 238U present. Assuming that no lead was originally present, that all the
maxonik [38]

Answer:

t = 3,496x10⁹ years

Explanation:

The decay of ²³⁸U is:

²³⁸U → ²⁰⁶Pb + 8He + 6e⁻

Moles of ²⁰⁶Pb presents in 0,623mg are:

0,623x10⁻³g×(1mol / 206g) = 3,02x10⁻⁶ moles of ²⁰⁶Pb.

These moles are equals to moles of ²³⁸U before decay, that means, 3,02x10⁻⁶ moles²³⁸U

In grams:

3,02x10⁻⁶ moles²³⁸U× (238g / 1mol) = 7,20x10⁻⁴ g ²³⁸U = 0,720 mg²³⁸U

That means initial ²³⁸U was 1,000mg + 0,720mg =<em> 1,720mg</em>

Applying the formula:

ln (N₀/N) t₁₂ = t ln2

Where N₀ is initial amount of uranium (1,720mg), N is concentration of uranium (1,000mg),  half-life time is a constant (t₁₂= 4,468x10⁹ years) and t is the time transcurred for the reaction. Replacing:

ln(1,720/1)*4,468x10⁹ years = t ln2

<em>t = 3,496x10⁹ years</em>

<em></em>

I hope it helps!

6 0
2 years ago
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