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liraira [26]
3 years ago
12

Scientists use scientific notation to represent very small or very large numbers because this notation increases the

Chemistry
2 answers:
Lera25 [3.4K]3 years ago
7 0
This is a question that is hard to answer without any options or choices. I am answering the question based on my knowledge. <span>Scientists use scientific notation to represent very small or very large numbers because this notation increases the accuracy and decreases the chance of a mistake. I hope it has helped you.</span>
Luba_88 [7]3 years ago
5 0

convenience in using the numbers. just took the quiz

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5. 16.3 g of NaCl is dissolved in water to make 1.75 L of solution. What is the molarity of this solution? A 0.159 M B 0.278 M C
ira [324]

Answer: The molarity of this solution is 0.159 M.

Explanation:

Given: Mass of solute = 16.3 g

Volume = 1.75 L

Number of moles is defined as the mass of substance divided by its molar mass.

Hence, moles of NaCl (molar mass = 58.44 g/mol) ar calculated as follows.

Moles = \frac{mass}{molar mass}\\= \frac{16.3 g}{58.44 g/mol}\\= 0.278 mol

Molarity is the number of moles of a substance present in a liter of solution.

So, molarity of the given solution is calculated as follows.

Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.278 mol}{1.75}\\= 0.159 M

Thus, we can conclude that the molarity of this solution is 0.159 M.

5 0
3 years ago
What is the difference between the Warn-on-Forecast method and the current method of weather prediction?
Tanya [424]
I would think the answer would be C. Based off of what I've learned and heard. Sorry if it's not the correct answer though.
5 0
3 years ago
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How many grams of K2CO3 are needed to prepare a 400.0 mL of a 4.25M solution?
Basile [38]

Answer:

235 g

Explanation:

From the question;

  • Volume is 400.0 mL
  • Molarity of a solution is 4.25 M

We need to determine the mass of the solute K₂CO₃,

we know that;

Molarity = Number of moles ÷ Volume

Therefore;

First we determine the number of moles of the solute;

Moles = Molarity × volume

Moles of  K₂CO₃ = 4.25 M × 0.4 L

                           = 1.7 moles

Secondly, we determine the mass of  K₂CO₃,

We know that;

Mass = Moles × Molar mass

Molar mass of  K₂CO₃, is 138.205 g/mol

Therefore;

Mass = 1.7 moles × 138.205 g/mol

         = 234.9485 g  

         = 235 g

Thus, the mass of  K₂CO₃ needed is 235 g

7 0
3 years ago
What does genetic modification produce
Tamiku [17]

Answer:

Genetic modification or GMOs can change foods. It's typically used to preserve foods, enlargen foods or create seedless grapes

Explanation:

7 0
2 years ago
Which of the following effect increases the solubility of Ca(OH)2?
mash [69]

Answer:

adding an acidic solution

Explanation:

Strong acids dissociate completely in water and the H⁺ ions react with the OH⁻ ions to make H₂O. If we add an acid to our solution of Ca(OH)₂, the acid protons would react with some of the OH⁻ ions and drive the equilibrium to the right. More of the solid Ca(OH)₂ should dissolve.

4 0
2 years ago
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