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Vaselesa [24]
3 years ago
5

Which scientist was able to quantify the electron's charge and estimate its specific mass? A. J. J. Thomson B. Robert Millikan C

. Eugen Goldstein D. Ernest Rutherford
Chemistry
2 answers:
Katarina [22]3 years ago
8 0

Answer:

B. Robert Millikan

Explanation:

J.J. Thompson gave the plum pudding model of the atom.  

Millikan determined the charge and mass of an electron. Millikan’s oil drop experiment was conducted to measure the elementary charge ( or a unit charge).  

Eugen Goldstein discovered the anode rays or protons.  

Rutherford conducted the gold foil experiment and proved that the center of the nucleus has a positive charge and most of the atom’s mass lies in a small volume.  

Sidana [21]3 years ago
6 0

Millikan C

Hope this helps you out!

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How many grams of dry nh4cl need to be added to 2.50 l of a 0.800 m solution of ammonia, nh3, to prepare a buffer solution that
tia_tia [17]

Answer:

The correct answer is 574.59 grams.

Explanation:

Based on the given information, the number of moles of NH₃ will be,  

= 2.50 L × 0.800 mol/L

= 2 mol

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pOH = 14.00 - 8.53

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= -log (1.8 ×10⁻⁵)

= 5.00 - log 1.8

= 5.00 - 0.26

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Based on Henderson equation:  

pOH = pKb + log ([salt]/[base])

pOH = pKb + [NH₄⁺]/[NH₃]

5.47 = 4.74 + log ([NH₄⁺]/[NH₃])

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8 0
3 years ago
What is the<br> mass of 1.82<br> moles of<br> Lithium<br> carbonate?
frutty [35]

Answer:

244.76

Explanation:

The weight of grams by 1.82 moles of lithium carbonate would be: 134.481438 So we need to use this equation to find mass by grams m × g = ms Where m is for moles, g for grams, and ms for mass. So now we need use this equation: 1.82 × 134.481438 = ? 1.82 × 134.481438 = 244.75621716 244.75621716, rounded-up (to the nearest-tenths place) is 244.76. So now you have it! The mass of 1.82 moles of lithium carbonate is 244.76!  

7 0
3 years ago
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