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svet-max [94.6K]
3 years ago
8

Is alcohol evaporating a chemical or physical change

Chemistry
1 answer:
snow_tiger [21]3 years ago
8 0
Physical change , the states are changing from liquid to gas
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La is element 57 on the periodic table a sample contains 2.82 * 10€25 power atoms of La calculate the amount of LA
vodka [1.7K]

Answer:

n=46.8molLa\\\\m=6.50x10^3gLa

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate both moles and grams of lanthanum by using the Avogadro's number as a relationship of atoms to moles and its atomic mass as a relationship to moles to grams to obtain the following:

n=2.82x10^{25}atomsLa*\frac{1molLa}{6.022x10^{23}atomsLa}=46.8molLa\\\\m=46.8molLa*\frac{138.9gLa}{1molLa}  =6.50x10^3gLa

Regards!

5 0
3 years ago
What name is given to substances that resist changes in ph?
nignag [31]
These are buffer systems (solutions of substances) with a steady concentration of hydrogenium ions. At addition to such solution of a small amount of acid or alkali does not change рН.
For example:
CH₃COOH + CH₃COONa    acetate buffer
KH₂PO₄ + K₂HPO₄  potassium phosphate buffer
4 0
3 years ago
Which of the following compounds exhibits optical isomerism?
Harman [31]
Uhh I think it’s C ;)
6 0
3 years ago
Please help me with this chemistry question, ill mark as brainliest
Anna35 [415]
All of the acid molecules in beaker 1 dissociate fully and exist as and ions. As a result, beaker 1 represents a strong acid solution. The majority of the molecules in beaker 2 are undissociated.
7 0
3 years ago
A 4.82L balloon filled with gas is warmed from 243.1K to 300.1 K. What is the volume of the gas after it is heated?
Ksenya-84 [330]

Answer:

5.95 L

Explanation:

V1/V2 = T1/T2

4.82 L/V2 = 243.1K/300.1K

V2 = 4.82*300.1/243.1 L = 5.95 L

5 0
3 years ago
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