Stoic

How many grams of LiBr could be produced if 120 grams of Br₂ react with extra LiF?

• 65.3 g of LiBr

• 130 g of LiBr

• 803 g of LiBr

• 20880 g of LiBr

Tags

NGSS.HS-PS1-7

Put the correct labels in the correct spots.

c

d

b

a

given of Al(OH)3

molar mass of sodium

molar mass of Al(OH)3

mole ratio

Tags

NGSS.HS-PS1-7

Match the following conversions to where you get them.

• MEMORIZED

  6.022 x 10²³ particles = 1 mole

• Liters to mole

• big numbers from the reaction

• mole ratio

• periodic table

• molar mass

• MEMORIZED

  22.4 L = 1 Mole

• particles to moles

Where do you get the mole ratio from?

• periodic table

• coefficients in the reaction

• you just have it memorized

• it is always one

• I don't know

The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting

• Percent

• actual

• stoichiometry

• theoretical

Order the following conversion factors if you are going from grams of X to grams of Y.

• molar mass of X

• given of X

• mole ration X & Y

• molar mass of Y

Tags

NGSS.HS-PS1-7

The limiting reactant

• slows the reaction down

• is used up first

• is the reactant that is left over

• controls the speed of the reaction

How many grams of AgNO₃ (MM = 169.87) are needed to prepare 0.125M solution in 250 mL of water? 

• .03g

• 0.5g

• 5.3g

• 84.9g

Answer explanation

To calculate the grams needed, use the formula: grams = Molarity x Volume x Molar Mass. Substituting the values, grams = 0.125 x 0.25 x 169.87 = 5.3g. Therefore, 5.3g of AgNO3 are needed to prepare the solution.

Which of the following best describes the concept of stoichiometry in chemistry?

• The study of the speed of chemical reactions

• The calculation of reactants and products in chemical reactions

• The analysis of chemical bonds

• The measurement of energy changes in reactions

In a balanced chemical equation, the coefficients represent the ratio of what?

• Masses of reactants and products

• Volumes of gases

• Moles of reactants and products

• Concentrations of solutions

Tags

NGSS.HS-PS1-7