To find the atomic mass of a particular atom you need to know

Chemistry

2 answers:

Andreyy893 years ago

5 0

You just need the number of protons and number of neutrons as the mass of eelctrons is negligible

Kipish [7]3 years ago

5 0

Answer:

C. the number of protons and neutrons

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A solution has a [OH-] of 1 × 10-9. What is the pOH of this solution?

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POH = - log [ OH⁻ ]

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3 years ago

Solid NaBr is slowly added to a solution that is 0.073 M in Cu+ and 0.073 M in Ag+.Which compound will begin to precipitate firs

saul85 [17]

Answer :

AgBr should precipitate first.

The concentration of $Ag^+$ when CuBr just begins to precipitate is, $1.34\times 10^{-6}M$

Percent of $Ag^+$ remains is, 0.0018 %

Explanation :

$K_{sp}$ for CuBr is $4.2\times 10^{-8}$

$K_{sp}$ for AgBr is $7.7\times 10^{-13}$

As we know that these two salts would both dissociate in the same way. So, we can say that as the Ksp value of AgBr has a smaller than CuBr then AgBr should precipitate first.

Now we have to calculate the concentration of bromide ion.

The solubility equilibrium reaction will be:

$CuBr\rightleftharpoons Cu^++Br^-$