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sammy [17]
4 years ago
10

The chemical formula for beryllium oxide is BeO.A chemist determined by measurements that 0.045 moles of beryllium participated

in a chemical reaction. Calculate the mass of beryllium that participated in the chemical reaction. Round your answer to significant digits.
Chemistry
1 answer:
blondinia [14]4 years ago
8 0

Answer: 0.405g

Explanation:

Molar Mass of Be = 9g/mol

Number of mole of Be = 0.045mol

Mass conc. Of Be = 0.045 x 9 = 0.405g

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There are 0.15 ml of the water contains 150 mg of Pb .

Calculation ,

Formula used :

density = mass / volume                 ( i )

Given mass of the Pb in milligram ( mg ) = 150 mg

Given mass of the Pb in gram ( g ) = 150 × 10^{-3} = 0.15 gram

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We have to find volume of water in milliliter ( ml ) .

Putting the value of mass of the Pb , lead and density in equation ( i ) we get the volume of water in milliliter ( ml ) .

density = mass / volume

1.0 g/ml  =  0.15 gram / volume

volume =  0.15 gram / 1.0 g/ml = 0.15 ml

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The following equation shows the equilibrium in an aqueous solution of ammonia: NH3(aq)+H2O(l)⇌NH4+(aq)+OH−(aq)NH3(aq)+H2O(l)⇌NH
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Answer:

c) H2O and OH−

Explanation:

Acids are the species which furnish hydrogen ions in the solution or is capable of forming bonds with electron pair species as they are electron deficient species.

When an acid donates a proton, it changes into a base which is known as its conjugate base.

Bases are the species which furnish hydroxide ions in the solution or is capable of forming bonds with electron deficient species as they are electron rich species. When a base accepts a proton, it changes into a acid which is known as its conjugate acid.

The acid and the base which is only differ by absence or presence of the proton are known as acid conjugate base pair.

Thus,  for the reaction,

NH_3+H_2O\rightleftharpoons Nh_4^++OH^-

The base is NH_3 and the conjugate acid of the base is NH_4^+.

Also, The base is OH^- and the conjugate acid of the base is H_2O.

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8 0
3 years ago
Show dipole dipole force of water and ethyll alcohol.​
Alexeev081 [22]

Answer:

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Note the positive and negative parts of both water and ethyl alcohol as expressed in the equations above.

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