Stoichiometry (Gizmo)
1. A student tried to solve the following problem by selecting the tile as shown. What, if anything, did
the student do wrong? - correct answer B. The student chose the correct tile, but needs to flip the tile to
make the units cancel
2. Based on the tiles, shown, how many moles of oxygen gas (O2) are needed to produce 36.04 grams of
water (H2O) when reacting with access ethane in the equation: 2C2H6 + 7O2 —> 5CO2 + 6H2O? -
correct answer C. 2.3 moles of oxygen (O2)
3. Which tile should be used to solve the following problem? - correct answer B. Tile B
4. Based on the equation below, how many more the aluminum sulfate (Al2(SO4)3) Will be produced
from the reaction of 5.8 moles of aluminum hydroxide (Al(OH)3) and excess sulfuric acid (H2SO4)?
2Al(OH)3 + 3H2SO4 = Al2(SO4)3 + 6H2O - correct answer A. 2.9 moles of aluminum sulfate
5. Based on the equation below, how many grams of nitrogen gas (N2) Will be produced from the
decomposition of one mole of sodium azide (NaN3)? Use a molar mass of 28.0 grams for nitrogen gas
(N2).
2NaN2 = 2Na + 2N2 - correct answer B. 42.0 grams