Everyday Stoichiometry

#1

The average human requires 120 grams of glucose (180.18 g/mol) per day. How many grams of CO₂ (44.01 g/mol) are required to produce this amount of glucose in plants?

The photosynthetic reaction is:

6 CO₂ + 6 H₂O ------> C₆H₁₂O₆ + 6 O₂

• 16.36 g CO₂

• 175.86 g CO₂

• 81.88 g CO₂

• 2947.73 g CO₂

Tags

NGSS.HS-ESS2-6

NGSS.HS-LS1-5

NGSS.HS-LS2-5

#2

Silver sulfide (Ag₂S) is the common tarnish on silver objects.

What mass of silver sulfide can be made from 12.30 g of hydrogen sulfide (H₂S) obtained from a rotten egg?

4Ag + 2H₂S + O₂ -----> 2Ag₂S + 2H₂O

• 268.24 g Ag₂S

• 1.69 g Ag₂S

• 894.1 g Ag₂S

• 89.41 g Ag₂S

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

#3

How many moles of Cu are needed to react with 3.50 moles of AgNO₃?

Cu + 2 AgNO₃ ---> Cu(NO₃)₂ + 2 Ag

• 3.50 moles Cu

• 1.75 moles Cu

• 7.0 moles Cu

• 10.75 moles Cu

Tags

NGSS.HS-PS1-7

#4

Cu + 2 AgNO₃ ---> Cu(NO₃)₂ + 2 Ag

If 89.5 grams of Ag were produced, how many grams of Cu reacted?

• 86.49 g Cu

• 105.46 g Cu

• 75.96 g Cu

• 26.36 g Cu

Tags

NGSS.HS-PS1-7

#5

Molten iron and carbon monoxide are produced in a blast furnace by the reaction of iron(III) oxide and coke (pure carbon). If 250 grams of pure Fe₂O₃ is used, how many grams of iron can be produced?

Fe₂O₃ + 3 C ---> 2 Fe + 3 CO

• 3.13 g Fe

• 43.71 g Fe

• 111.49 g Fe

• 174.86 g Fe

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

#6

4 NH₃ + 5 O₂ ---> 4 NO + 6 H₂O

When 1.20 moles of ammonia (NH₃) reacts, the total mass of water produced is?

• 28.82 g water

• 32.44 g water

• 16.22 g water

• 6 g water

Tags

NGSS.HS-PS1-7

#7

2 NaClO₃ ---> 2 NaCl + 3 O₂

12.00 moles of NaClO₃ will produce how many grams of O₂?

• 576 grams of Oxygen

• 5.41 grams of Oxygen

• 7.22 grams of Oxygen

• 19.96 grams of Oxygen

Tags

NGSS.HS-PS1-7

#8

2 NaClO₃ ---> 2 NaCl + 3 O₂

How many grams of NaCl are produced when 80.0 grams of O₂ are produced?

• 194.8 grams of NaCl

• 48.7 grams of NaCl

• 97.4 grams of NaCl

• 49.86 grams of NaCl

Tags

NGSS.HS-PS1-7