The formula unit for a compound made from lead (Pb4+) and sulfur (s) is PbS2 or lead sulfide.
Sulfur has an anion, its in family 16; thus it has 6 valence electrons; therefore it will need to gain two electrons to attained an octet configuration, giving it a charge of 2-. Lead has four valence electrons; it will need to lose four electrons to be stable; it will therefore give the four electrons to two sulfur atoms.
Answer:
A. Limiting reactant is A.
B. Limiting reactant is A.
C. Limiting reactant is B.
D. Limiting reactant is B.
Explanation:
It is possible to find the limiting reactant for a reaction taking the moles of a reactant that will react and using the chemical equation find the moles of the other reactant you will need.
For the reaction:
2A + 4B → 3C
A. 2 moles A requires:
2molA×= 4moles of B
As you have 5 moles of B, <em>limiting reactant is A.</em>
B. 1,8 moles A requires:
1,8 molA×= 3,6 moles of B
As you have 4 moles of B, <em>limiting reactant is A.</em>
C. 3 moles A requires:
3 molA×= 6 moles of B
As you have just 4 moles of B, <em>limiting reactant is B.</em>
D. 22 moles A requires:
22 molA×= 44moles of B
As you have just 40 moles of B, <em>limiting reactant is B.</em>
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Answer:
Explanation:
Hello!
In this case, since the undergoing chemical reaction is:
It is widely known that when a gas given off from a reaction is collected over water, we can compute its pressure by minusing the total pressure 762 mmHg and the vapor pressure of water at the experiment's temperature (20 °C) in this case 17.5 mmHg as shown below:
Next, by using the ideal gas equation we compute the yielded moles of oxygen considering the collected 313 mL (0.313 L):
Now, via the 3/2:1 mole ratio between oxygen and lithium chlorate (molar mass = 90.39 g/mol), we compute the original mass of decomposed lithium chlorate as follows:
Now, the percentage is computed as shown below:
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Answer:
17.03052 g/mol
Explanation:
Ammonia formula is given as NH3.
To estimate the molar mass of any compound, we have to add up the molar masses of every atom of the given compound. Ammonia comprises of one nitrogen atom and three hydrogen atoms.
So the molar mass of ammonia is
N: 14.0067 g/mol
H: 1.00794 g/mol
The molar mass of ammonia will thus be
14.0067 g/mol +3× 1.00794 g/mol =17.03052 g/mol