Answer:
The balanced equation for this reaction is C2H2 + 502 + 4H2O + 3C02. What volume of carbon dioxide is produced when 2.8 L of oxygen are consumed? 25Explanation:
The english translation of the question is:
Paraffin combustion is a chemical change?
Answer:
Yes
Explanation:
The chemical change is defined as the change in chemical composition of substance while physical change is defined as the change in physical appearance which can return to original shape again.
The combustion of paraffin is a chemical change because during combustion the chemical structure of the paraffin has been changed.
Hence, the given statement is true.
Answer:
Hello There!!
Explanation:
Pure products come from and made where they are original made and raw products are just pasteurized with no added ingredients included in them.
hope this helps,have a great day!!
~Pinky~
How do you know how many atoms are in a chemical formula?
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in the formula. It also represents the number of molecules of that compound. has 4 sodium atoms, 2 sulphur atoms, and 8 oxygen atoms. When you count atoms, remember to multiply the coefficient number and the subscript number to find the number of atoms of that element.
Answer:
Option B.
Explanation:
- 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂
First we <u>convert 9.90 g of Pb(NO₃)₂ into moles</u>, using its molar mass:
- 9.90 g ÷ 331.2 g/mol = 0.0299 mol Pb(NO₃)₂
Then we<u> convert moles of Pb(NO₃)₂ into moles of PbO</u>, using the stoichiometric coefficients:
- 0.0299 mol Pb(NO₃)₂ * = 0.0299 mol PbO
Now we<u> convert 0.0299 mol PbO into grams</u>, using its molar mass:
- 0.0299 mol PbO * 223.2 g/mol = 6.67 g PbO
So <em>6.67 g is the theoretical yield</em>. With that in mind <u>we calculate the percent yield</u>:
- % yield = 5.51 / 6.67 * 100 % = 82.6%
So the correct answer is option B.