Question

When solving stoichiometry problems, you are often required to "invert" the molar mass of at least one of the compounds that you're working with. Select the two best descriptions of the term "invert" as it is used in our problems. (2 points)
Responses

Inverting is like "using the reciprocal" for a fraction.
Inverting is like "using the reciprocal" for a fraction.

Inverting means to "flip" instead of g/mol you'll have mole/grams as your units.
Inverting means to "flip" instead of g/mol you'll have mole/grams as your units.

Inverting the molar mass means to multiply by the number of coefficients in the problem.
Inverting the molar mass means to multiply by the number of coefficients in the problem.

Inverting means to "subtract" the masses of the elements that make up the compound.
Inverting means to "subtract" the masses of the elements that make up the compound.
Question 2
In a certain problem you are asked to convert from the known mass of one compound into the mass of another compound. Place the required pieces of information into the most logical sequence that would result in proper calculations by helping reduce errors in order of operations. (4 points)
Arrange responses in the correct order to answer the question. Select a response, navigate to the desired position and insert response at that position. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can be moved using the up and down arrow keys or by dragging with a mouse.
Question 3
All stoichiometric calculations must begin with a balanced equation.(1 point)
Responses

True
True

False
False

Answer 1

Q1 — Select two best descriptions (choose both):
- Inverting is like "using the reciprocal" for a fraction.
- Inverting means to "flip" — instead of g/mol you'll have mol/g as your units.

Q2 — Correct sequence (from known mass of A to mass of B):
1. Start with a balanced chemical equation (to get mole ratios).
2. Convert the known mass of compound A to moles using A’s molar mass.
3. Use the mole ratio from the balanced equation to convert moles of A → moles of B.
4. Convert moles of compound B to mass using B’s molar mass.

Q3 — True or False:
- True.