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irga5000 [103]
3 years ago
6

How many atoms are in 8 gram of helium

Chemistry
1 answer:
Yuri [45]3 years ago
5 0
There are two atoms..............
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g Enter your answer in the provided box. If 30.8 mL of lead(II) nitrate solution reacts completely with excess sodium iodide sol
Ronch [10]

Answer:

M=0.0637M

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

Pb(NO_3)_2(aq)+2NaI(aq)\rightarrow PbI_2(s)+2NaNO_3(aq)

Thus, for 0.904 g of precipitate, that is lead (II) iodide, we can compute the initial moles of lead (II) ions in lead (II) nitrate:

n_{Pb^{2+}}=0.904gPbI_2*\frac{1molPbI_2}{461gPbI_2}*\frac{1molPb(NO_3)_2}{1molPbI_2}  *\frac{1molPb^{2+}}{1molPb(NO_3)_2} =1.96x10^{-3}molPb^{2+}

Finally, the resulting molarity in 30.8 mL (0.0308 L):

M=\frac{1.96x10^{-3}molPb^{2+}}{0.0308L}\\ \\M=0.0637M

Regards.

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2 years ago
Useful:<br>Harmful:<br>2. Give an example of how Bacteria can be useful and harmful to man.​
kupik [55]

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protect the skin

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3 years ago
sodium ions are moving with their concentration gradient with the use of a protein channel across a plasma membrane. Determine t
jeka57 [31]

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Explanation:

When there is difference between the concentration of the content of a cell and the solution surrounding the cell, there will be an Electrochemical gradient or Concentration gradient. Therefore, some solute will tend to move from the region of high concentration to the region of lower concentration through the cell membrane.

Such a movement is called Primary Active Transport

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3 years ago
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Which term correctly describes all of the following materials ? Salt water,vinegar , bronze,air,beach sand?
maksim [4K]

Answer:

ummmm hey

Explanation:

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What is the molar mass of NaC2H302?
andrezito [222]

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Count each element and the number of atoms for each element. Add them all together. Use the periodic table.

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