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marshall27 [118]
3 years ago
8

What is the mass of 2 moles of 238 u?

Chemistry
2 answers:
Ad libitum [116K]3 years ago
5 0
<span>use this formula mass = moles x molar mass</span>
Lana71 [14]3 years ago
3 0

Answer:

Mass of 2 moles of ^{238}\textrm{U} is 476.1 g

Explanation:

  • We know that number of moles of an atom is ratio of mass of the atom to it's atomic weight.
  • Atomic weight of ^{238}\textrm{U} is 238.05 g/mol
  • So, mass of 1 mol of ^{238}\textrm{U} atom is 238.05 g
  • Hence mass of 2 moles of ^{238}\textrm{U} = (2mol\times 238.05g/mol)=476.1 g
  • Hence mass of 2 moles of ^{238}\textrm{U} is 476.1 g
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Answer:125.84g

Explanation:Sucrose is dissacharides an organic compound in the class of carbonhydrate with the chemical formula C11H22O11.molar concentration is given by number of moles/Volume,this implies that moles=molar concentration ×Volume=0.130M×2.75L=0.3575moles.

Furthermore,number of moles=Mass of Sucrose/molecular Mass of Sucrose.

From it's formular C11H22O11, molecular Mass is the addition of the mass number which is 12 for C,2 for H and 16 for oxygen,O.so molecular Mass of Sucrose is (12×11)+(2×22)+(16×11)=352.

So mass =moles ×molecular mass=0.3575moles×352g/moles=125.84g

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3 years ago
A gas is initially at a pressure of 4.7 atm and a volume of 7.5 L. When the volume is increased to 10.5 L, what is the new press
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Answer:

P2=3.36 atm

Explanation:

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Write the net ionic equation for the reaction that occurs when equal volumes of 0.546 M aqueous acetylsalicylic acid (aspirin) a
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Answer:

C_9H_8O_4+C_2H_3O_2^-\rightarrow C_2H_4O_2+C_9H_7O_4^-

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to figure out the required net ionic equation by firstly writing out the complete molecular equation between aspirin and sodium acetate:

C_9H_8O_4+NaC_2H_3O_2\rightarrow C_2H_4O_2+NaC_9H_7O_4

Whereas acetic acid and sodium acetylsalicylate are formed. Now, we write the complete ionic equation whereby sodium acetate and sodium acetylsalicylate are ionized because they are salts yet neither aspirin nor acetic acid are ionized as they are weak acids:

C_9H_8O_4+Na^++C_2H_3O_2^-\rightarrow C_2H_4O_2+Na^++C_9H_7O_4^-

Finally, for the net ionic equation we cancel out the sodium spectator ions to obtain:

C_9H_8O_4+C_2H_3O_2^-\rightarrow C_2H_4O_2+C_9H_7O_4^-

Regards!

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