In the reaction 2Na + 1Cl2 ----> 2NaCl what is the ration of the coefficients?
2:1:2
100
The actual amount of a product that is obtained is termed the?
Actual Yield
100
You gather a sample of graphite (carbon) from the field and it weighs 76 grams. How many moles of carbon did you collect?
6.3333 moles carbon
100
Balance the equation:
Fe + O2 → Fe3O4
3Fe + 2O2 → 1 Fe3O4
200
What is the atomic symbol for Calcium?
Ca
200
The very first thing you should check before working out a stoichiometry problem is if the equation is?
Balanced
200
The ratio that compares what you should get to what you actually do. (Theoretical and Actual) is converted to a percent to show
Percentage Yield
200
Assuming you produce 800 moles of H2O. How many grams of H2O did you produce?
14,400 grams of H2O
200
BaO2 → BaO + O2
2 BaO2 → 2 BaO + 1 O2
300
Calcium with no charge possess' how many protons, neutrons, and electrons?
20
300
C3H8 + 5O2 3CO2 + 4H2O
How many moles of carbon dioxide will form if 5.5 moles of C3H8 is burned
16.5 moles CO2
300
You do the math on a reaction that is designed to produce salt. You calculate that you should obtain 65 grams of salt. When you actually measure your product you really only made 40 grams of salt. What would be the percentage Yield of this reaction?
61.538 Percent
300
HCl is used in titrations to neutralize bases. Assuming you needed 6 moles of HCl to completely neutralize the base how much would you need to weigh out in grams?
216 grams of HCl
300
Pb(NO3)2 + HCl → PbCl2 + HNO3
1 Pb(NO3)2 + 2 HCl → 1 PbCl2 + 2 HNO3
400
An element has an atomic number of 23 and a charge of -2. How many electrons does this atom possess?
25
400
C3H8 + 5O2 3CO2 + 4H2O
If 30.0 moles of oxygen are used, how many grams of water will form?
432 grams of water will form
400
An experiment should produce 60 grams of HCl. How ever the percentage yield for this reaction is only 40%. How much HCl is produced and collected in the reaction?
24 grams of HCl
400
it takes .0000000000000000867 moles of Botulism toxin to kill a human being when infected directly to the venous system. How many grams would it take? molar mass for chlorstridium botulism is 150,000 grams.
.0000000013 grams check with graphing calculator.
400
C6H5Cl + SiCl4 + Na → (C6H5)4Si + NaCl
4C6H5Cl + 1 SiCl4 + 8 Na → 1 (C6H5)4Si + 8 NaCl
500
Salt NaCl is formed by an ionic bond between sodium and chlorine. Briefly describe why the outer electrons of sodium and chlorine form a bond with each other. (hint) electron shells.
To fill up their outer shells sodium drops its outter electron giving it an overall positive charge while Chlorine picks up an electron giving it an overall negative charge. Opposite charges attract leading to the formation of salt a neutral molecule.
500
Using the following equation:
2 NaOH + H2SO4 2 H2O + Na2SO4
How many grams of sodium sulfate (Na2SO4) will be formed if you start with 200 grams of sodium hydroxide (NaOH) and you have an excess of sulfuric acid?
355 grams Na2SO4
500
The balanced chemical equation for Aluminum Oxide is shown below:
4Al + 3O2 ------> 2Al2O3
Given that the reaction has a percentage yield of 70% how much Aluminum Oxide could you expect to produce if you only had 50g of Al?
127.93 grams of Aluminum Oxide
500
Finally if the world had a molar mass of 70,000,000,000,000,000 grams per mole of the world. How many grams would be contained in .5 moles of the world?