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Jet001 [13]
4 years ago
6

The elements below show the atomic number, element

Chemistry
1 answer:
bija089 [108]4 years ago
8 0

Answer:

Using the percentage method . Taking a small sample and measuring the percentage of each isotope then calculating average atomic mass.

Explanation:

Average atomic mass can be determine by percentage method.

Consider the following example:

Abundance of C¹² = 98.89%

Abundance of C¹³ = 1.11%

Atomic mass of C¹² = 12.000 amu

Atomic mass of C¹³ = 13.003 amu

Average atomic mass = ?

Solution:

Average atomic mass of carbon = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass of carbon = (12.000×98.89)+(13.003×1.11) /100

Average atomic mass of carbon=  1186.68 + 14.43333 / 100

Average atomic mass of carbon = 1201.11333 / 100

Average atomic mass of carbon = 12.01 amu

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Convert 0.00763 nL to L
Reptile [31]

Answer:

7.63\cdot10^{-12} L

Explanation:

Conversion problems could be solved using dimensional analysis for convenient use and understanding. Dimensional analysis is a technique of multiplying the measure we have by a fraction corresponding to some two equal measures in different units.

In order to apply dimensional analysis here, we firstly need to know that a prefix 'n' stands for 'nano', and nano means 10^{-9}. In this case, we have nanoliters. Using the prefix, we can find a relationship between nanoliter and liter:

1 nL = 10^{-9} nL

We may now apply dimensional analysis. Since we wish to convert into liters, we'll be multiplying the number we have in nL by a fraction that contains this relationship with liters in the numerator and nanoliters in the denominator, so that nL terms cancel out and we would obtain the final answer in liters:

0.00763 nL\cdot \frac{10^{-9} L}{1 nL}=7.63\cdot10^{-12} L

6 0
3 years ago
Is the dissolving of copper (ii) chloride in water a chemical change or a physical change why?
bija089 [108]
It would be a chemical change because the chloride water would have an effect on the copper. A way to tell if something is a chemical or physical change is that chemical change is not reversible. Physical change can be reversed. For example, water can be physically changed into ice, and it can go back into water. Hope this helps!
4 0
3 years ago
How many grams of 2.5% "h" cream should be mixed with360 grams of 0.25% "h" cream to make a 1% "h" cream?
Leona [35]
Answer is: 180 <span>grams of 2.5% "h" cream should be mixed.
</span>ω₁ = 2.5% ÷ 100% = 0.025.
ω₂ = 0.25% ÷ 100% = 0.0025.
ω₃ = 1% ÷ 100% = 0.01.
m₂ = 360 g.
m₃ = m₁ + 360 g.
m₁ = ?.
ω₁ · m₁ + ω₂ · m₂ = ω₃ · m₃.
0.025 · m₁ + 0.0025 · 360 g = 0.01 · (m₁ + 360 g).
0.025 · m₁ + 0.9 g = 0.01 · m₁ + 3.6 g.
0.015 · m₁ = 2.7 g.
m₁ = 180 g.
4 0
3 years ago
PLEASE HELP I WILL MARK BRAINLIEST
Art [367]

Answer:

Block A

Explanation:

7 0
3 years ago
I have to do an experiment about reaction rates, and i need to have things to dissolve..
Leona [35]

Answer:

salt ( with food coloring)

sand

sodium chloride

coffee

flour

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2 years ago
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