8.2 Discussion: stoichiometry
Authored by Lan Vu
Chemistry
10th Grade
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
From the reaction: B2H6 + 3O2 -->2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
B2H6 = 27.68 g/mol
13.8 g O2
3.91 mol of O2
125 g O2
41.7 g O2
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Using the balanced chemical equation:
2C4H10 + 13O2 --> 10H2O + 8CO2
Calculate the number of grams of C4H10 needed to produce 5.12 moles of CO2.
58.0 g C4H10
2.56 g C4H10
74.2 g C4H10
37.19 g C4H10
4.
MATH RESPONSE QUESTION
3 mins • 1 pt
If 1.2 × 1023 particles of CH4 are reacted, how many liters of HCN will be produced at STP? Round your answer to 2 decimal places.
CH4 + NH3 → HCN + 3 H2
Mathematical Equivalence
ON
Answer explanation
At STP, 1 mole of HCN will occupy 22.4 liters of volume. Since 1.2 × 1023 particles of CH4 is equal to 6.0 × 1022 moles of CH4, 6.0 × 1022 moles of HCN will be produced. Therefore, the total volume of HCN produced at STP will be 6.0 × 1022 × 22.4 = 1.35 × 1024 liters.
5.
MATH RESPONSE QUESTION
3 mins • 1 pt
2 Pb(NO3)2 → 2 PbO + 4 NO2 + O2
If 34.559 liters of O2 are produced at STP, how many moles of Pb(NO3)2 were reacted? Round answers to 2 decimal places
Mathematical Equivalence
ON
6.
MATH RESPONSE QUESTION
3 mins • 1 pt
2 SO3 → 2 SO2 + O2
If 94.98 grams of SO2 are produced, how many grams of SO3 were reacted? Round to the correct number of significant Figures.
Mathematical Equivalence
ON
7.
MATH RESPONSE QUESTION
3 mins • 1 pt
HC2H3O2 + RbOH → RbC2H3O2 + H2O
If 17.55 grams of RbOH are reacted, how many grams of HC2H3O2 will also be reacted? Round your answer to the correct number of sig-fig.
Mathematical Equivalence
ON
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