Stoichiometry

What is the mole ratio of H2O to H3PO4 in the following chemical equation?

• 1 to 6

• 3 to 2

• 4 to 6

• 2 to 3

Tags

NGSS.HS-PS1-7

Knowing the mole ratio of a reactant and product in a chemical reaction would allow you to determine:

• the energy released in the reaction.

• the speed of the reaction.

• whether the reaction is reversible.

• the mass of the product produced from a known mass of reactant.

Tags

NGSS.HS-PS1-7

In the reaction represented by the equation CH4(g) + O2(g) ----> CO2(g) + H2O(g), a mass of 125 g CH4 is reacted with excess oxygen. The expression:

• mass of oxygen redacted.

• mass of carbon dioxide produced.

• mass of water produced.

• none of the above.

Tags

NGSS.HS-PS1-7

• 2 : 1

• 1 : 1

• 3 : 2

• 6 : 8

The blue numbers in the image below represent ________

• I don't know, and don't want to try

• coefficients

• subscripts

• none of the answers are correct

A number written in front of a chemical formula is called a(n)

• subscript

• superscript

• yield

• coefficient

What is a coefficient?

• The small number on the right of the chemical symbol.

• The large number to the left of a formula.

• 1 : 3

• 2 : 3

• 1 : 1

• 3 : 2

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation N_2+3H_{2 ightarrow ext{2NH}_3}, how many moles of nitrogen (N2) are required to produce 18 grams of ammonia (NH3)?

• 0.9 mol

• 18 grams

• 0.53 mol

• 36 grams

Tags

NGSS.HS-PS1-7

The most steps are required to solve stoichiometry problems when the reactant is given in grams and the product is sought in

• moles.

• grams.

• liters.

• number of atoms.