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olga_2 [115]
2 years ago
10

Please help quickly!

Chemistry
1 answer:
Galina-37 [17]2 years ago
5 0

Answer:

Iron II - pale green

Copper II - blue

Iron III - orange /brown

Nickel - green

Iron and Copper

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How many molecules are in 2.3 moles of h2o
Naddik [55]

Each mole of substance contains 6.02 x <span>1023</span> component parts, in this case water molecules.

If you have 2.3 moles of water you will have 2.3 x 6.02 x <span>1023</span> which is 1.3846 x <span>1024</span> molecules.

Each molecule contains 2 hydrogen atoms, so the total number of hydrogen atoms in 2.3 moles of water will be 2 x 1.3846 x <span>1024</span> = 2.7692 x <span>1024</span>.

Please mark brainliest, thanks :)

7 0
3 years ago
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How many O2 molecules can be made with the oxygen from 492 g of sodium phosphate?
serg [7]
<span>To answer this question, you need to change the sodium phosphate unit into mol and doing the reaction. Sodium phosphate or Na3PO4  molecular weight is 163.94 or 164 rounded up. Then the amount should be: 492g/ (164g/mol)= 3 mol

For every 1 mol of </span>Na3PO4  there are 4 mol of oxygen element. To made 1 mol of O2 molecule, you will need 2 mol oxygen element. Then the amount of oxygen should be: 4/2 * 3 mol= 6 mol * 6.02 * 10^23= 36.12 * 10*23= 3.61 * 10^24

7 0
3 years ago
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We can dilute an aqueous solution by adding liquid water to the solution, resulting in a less concentrated solution. Which of th
Neporo4naja [7]

Answer: = C

Explanation:

evaporating some of the water contained in the solution will increase the concentration of the resulting solution, because there will be concomitant increase in the number of moles of the solute left in the solution.

8 0
3 years ago
What is the mass, in grams, of 2.50 * 10-3 mol of aluminum sulfate?
Nonamiya [84]

Answer:

The mass is 0.855 grams (option A)

Explanation:

Step 1: Data given

aluminium sulfate = Al2(SO4)3

Numer of moles Al2(SO4)3 = 2.50 * 10^-3 moles

atomic mass Al = 26.99 g/mol

atomic mass S = 32.065 g/mol

Atomic mass O = 16 g/mol

Step 2: Calculate molar mass Al2(SO4)3

Molar mass = 2* 26.99 + 3*32.065 + 12*16

Molar mas = 342.175 g/mol

Step 3: Calculate mass Al2(SO4)3

Mass Al2(SO4)3 = moles Al2(SO4)3 * molar mass Al2(SO4)3

Mass Al2(SO4)3 = 2.5 *10^-3 moles * 342.175 g/mol

Mass Al2(SO4)3 = 0.855 grams

The mass is 0.855 grams (option A)

5 0
3 years ago
What is the net ionic equation for the reaction that is represented by the following total ionic equation? 6Na+ + 2Ca^2+ + 6CI-
vfiekz [6]

Answer:

\boxed{\rm 3Ca^{2+} + 2PO_{4}^{3-} \longrightarrow Ca_{3}(PO_{4})_{2}}

Explanation:

\textbf{Ionic equation}\\\rm \textbf{6Na}^{+} + 3Ca^{2+} + \textbf{6Cl}^{-} + 2PO_{4}^{3-} \longrightarrow \textbf{6Na}^{+} + \textbf{6Cl}^{-} + Ca_{3}(PO_{4})_{2}

Net ionic equation

Cancel all ions that appear on both sides of the reaction arrow (in boldface).

\boxed{\rm 3Ca^{2+} + 2PO_{4}^{3-} \longrightarrow Ca_{3}(PO_{4})_{2}}

3 0
2 years ago
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