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IrinaVladis [17]
3 years ago
12

Please help!

Chemistry
1 answer:
valkas [14]3 years ago
3 0
The answer is B . Brønsted-Lowry Acid/bases trade H+
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The sample of 15.0 g of KCl is dissolved into a solution with a total volume of 250.0 mL. What is the molarity of KCl in the sol
lina2011 [118]

Answer:

0.805 M.

Explanation:

Hello!

In this case, since the molarity of a solution is computing by dividing the moles of solute over the volume of solution in liters (M=n/V), for 15.0 g of potassium chloride (74.55 g/mol) we compute the corresponding moles:

n=15.0gKCl*\frac{1molKCl}{74.55gKCl}=0.201molKCl

Next, since the volume is 0.2500 in liters, the molarity turns out:

M=\frac{0.201mol}{0.2500L} \\\\M=0.805M

Best regards!

3 0
3 years ago
A scientist is raising the temperature of a
Arlecino [84]

Answer:

nothing

Explanation:

Here no result have been found yet..

Therfore we cannot determine which variable is dependent and which is not

8 0
1 year ago
The mass percent of Cl⁻ in a seawater sample is determined by titrating 25.00 mL of seawater with AgNO₃ solution, causing a prec
Serga [27]

Answer:

2.5 %

Explanation:

Considering:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Or,

Moles =Molarity \times {Volume\ of\ the\ solution}

Given :

For AgNO_3 :

Molarity = 0.2850 M

Volume = 63.30 mL

The conversion of mL to L is shown below:

1 mL = 10⁻³ L

Thus, volume = 63.30 × 10⁻³ L

Thus, moles of AgNO_3 :

Moles=0.2850 \times {63.30\times 10^{-3}}\ moles

Moles of AgNO_3  = 0.0180405 moles

Moles of AgNO_3  = Moles of Cl^-

Thus, Moles of Cl^- = 0.0180405 moles

Molar mass of Cl^- = 35.453 g/mol

Mass = Moles * Molar mass = 0.0180405 moles * 35.453 g/mol = 0.6396 g

Volume of sea water = 25.00 mL

Density = 1.024 g/mL

Density = Mass / Volume

Mass = Density * Volume = 1.024 g/mL * 25.00 mL = 25.6 g

Mass\ \%=\frac{Mass_{Chloride ion}}{Total\ mass}\times 100

Mass\ \%=\frac{0.6396}{25.6}\times 100

<u>Mass percent of Cl⁻ = 2.5 %</u>

4 0
3 years ago
Which of the following atoms has six valence electrons? (2 points)
irakobra [83]

The correct answer is Sulfur (S).


Sulfur has 6 valence electrons because it is located in Group 16 (or the sixth group over if you don’t count the transition metals). This means that one atom of sulfur has 6 electrons in its outermost shell out of 8 total “spots”, which you can count by counting the group numbers (excluding the transition metals) from Group 1 (with one valence electron) to Group 18 (the noble gases with full valence or outer shells).


By this same logic, Carbon (C) has 4 valence electrons and Cesium (Cs) has 1 valence electron, so neither of these is the correct answer.


Hope this helps!

4 0
4 years ago
How many states are there in the world?
Tems11 [23]

There are 195 countries in the world today. This total comprises 193 countries that are member states of the United Nations and 2 countries that are non-member observer states: the Holy See and the State of Palestine.

There are 50 US states.

The United States currently administers 16 territories as insular areas:

American Samoa.

Guam.

Northern Mariana Islands.

Puerto Rico.

U.S. Virgin Islands.

This information is from three sources. United Nations, Wikipedia, and United States and their satellite states aka countries.

5 0
3 years ago
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