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Margaret [11]
3 years ago
13

Calculate the [OH−] value with [H3O+]=3.0×10−9M.

Chemistry
1 answer:
saw5 [17]3 years ago
4 0
Yessssssssdddssssssss

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I NEED HELP NOW!!!!!!!!!!!
Rashid [163]

A: the ball in frame A had the highest velocity, and the ball in frame B has the highest kinetic energy

3 0
2 years ago
Which one of the following statements is not true concerning 2.00 L of a 0.100 M solution of Ca3(PO4)2?
Len [333]

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}     .......(1)

  • <u>For A:</u>

Molarity of calcium phosphate solution = 0.100 M

Volume of solution = 2.00 L

Putting values in equation 1, we get:

0.100M=\frac{\text{Moles of }Ca_3(PO_4)_2}{2.00}\\\\\text{Moles of }Ca_3(PO_4)_2=(0.100mol/L\times 2.00L)=0.200mol

Moles of calcium phosphate = 0.200 moles

  • <u>For B:</u>

1 mole of calcium phosphate contains 3 moles of calcium atoms, 2 moles of phosphate atoms and 8 moles of oxygen atoms.

So, 0.200 moles of calcium phosphate will contain = (8\times 0.200)=1.6 moles of oxygen atoms.

Moles of oxygen atoms = 1.6 moles

  • <u>For C:</u>

Molarity of calcium phosphate solution = 0.100 M

Volume of solution = 1.00 L

Putting values in equation 1, we get:

0.100M=\frac{\text{Moles of }Ca_3(PO_4)_2}{1.00}\\\\\text{Moles of }Ca_3(PO_4)_2=(0.100mol/L\times 1.00L)=0.100mol

Moles of calcium ions = (0.100\times 3)=0.300 moles

  • <u>For D:</u>

Molarity of calcium phosphate solution = 0.100 M

Volume of solution = 5.00 L

Putting values in equation 1, we get:

0.100M=\frac{\text{Moles of }Ca_3(PO_4)_2}{5.00}\\\\\text{Moles of }Ca_3(PO_4)_2=(0.100mol/L\times 5.00L)=0.500mol

Moles of phosphorus atoms = (0.500\times 2)=1.00 moles

According to mole concept:

1 mole of a compound contains 6.022\times 10^{23} number of atoms

Number of phosphorus atoms in 0.500 moles of calcium phosphate will be = (1.00\times 6.022\times 10^{23})=6.022\times 10^{23}

  • <u>For E:</u>

1 mole of calcium phosphate contains 3 moles of calcium ions and 2 moles of phosphate ions.

So, 0.200 moles of calcium phosphate will contain = (3\times 0.200)=0.600 moles of calcium ions

Moles of calcium ions = 0.600 moles

Hence, the correct answer is Option B.

6 0
2 years ago
The atom with 69 neutrons and 50 protons has a mass number of
GalinKa [24]

Name: Tin

Symbol: Sn

Atomic Number: 50

Atomic Mass: 118.71 amu

8 0
3 years ago
The substances in a chemical reaction that are combined or separated to form new substances are the _______.
madam [21]

<span>Good Morning!
 
</span><span>reactants
</span><span>
Substances that make up a chemical reaction, in order to be combined or separated, are called reagents. These reagents can be of the most varied types and origins. The result of this reaction is called a "product."
 
Hugs</span>
4 0
3 years ago
Read 2 more answers
List the colors of light in the visible spectrum in order<br> of increasing frequency.
masya89 [10]

Answer:

Violet 400 - 420 nm

Indigo 420 - 440 nm

Blue 440 - 490 nm

Green 490 - 570 nm

Yellow 570 - 585 nm

Orange 585 - 620 nm

Red 620 - 780 nm

Explanation:

5 0
3 years ago
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