Given :
A 10.99 g sample of NaBr contains 22.34% Na by mass.
To Find :
How many grams of sodium does a 9.77g sample of sodium bromine contain.
Solution :
By law of constant composition , in any given chemical compound, the elements always combine in the same proportion with each other.
Therefore , percentage of Na by mass in NaBr will be same for every amount .
Percentage of Na in 9.77 g NaBr is 22.34 % too .
Gram of Na =
.
Hence , this is the required solution .
[
] value of soft drink is 0.0001mol/l when given pH is 4.
Given:
pH = 4
Needs to find: [
]
Formula to find: pH=−log
[
]
We can put the values of pH in above formula as,
pH=−log
[
]
4 =−log
[
]
To calculate hydonium ion concentration, formula is as follows;
[
] = 
[
] =
= 0.0001mol/l
[
] value of soft drink is 0.0001mol/l
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6.4*10^10 is the answer in scientific notation
The answer would be balanced