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mafiozo [28]
3 years ago
10

A solution of NaOH has a concentration of 25.00% by mass. What mass of NaOH is present in 0.250 g of this solution? Use the peri

odic table in the toolbar if needed.
Chemistry
2 answers:
meriva3 years ago
7 0
The concentration of NaOH is 25.00% by mass, it means that 25.00% of the mass of the solution is of NaOH. Hence:

m_{NaOH}=25.00\%\times m_{solution}\Longrightarrow m_{NaOH}=\dfrac{25}{100}\times 0.250~g\iff\\\\\boxed{m_{NaOH}=0.0625~g}
Ulleksa [173]3 years ago
5 0

Answer : The mass of NaOH present in the solution is, 0.0625 grams

Explanation : Given,

Mass % = 25 %

Mass of solution = 0.250 g

Formula used :

Mass\%=\frac{\text{Mass of}NaOH}{\text{Mass of solution}}\times 100

Now put all the given values in this formula, we get the mass of NaOH.

25=\frac{\text{Mass of}NaOH}{0.250g}\times 100

\text{Mass of}NaOH=0.0625g

Therefore, the mass of NaOH present in the solution is, 0.0625 grams

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Makovka662 [10]

Answer:

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<em />

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7 0
2 years ago
Please help me with this answer correct
oksano4ka [1.4K]

Answer:

hope this helps :)

Explanation:

for the first one, you can look at the periodic table and look at the atomic number and it will show you how many protons there are giving you the answer because protons and electrons are equal in a pure element

a- carbon

b- neon

c- boron

d- oxygen

e- helium

f- hydrogen

g- lithium

h- beryllium

i- nitrogen

1- sulfur

2- S

3- 16

4- 32.066

5- 16

6- 16

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8- draw circles and put 16 dots like on the other page and in the middle put 16 nuetrons and electrons

9- 6 i think

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