Stoich: Mole-Mass, Mass- Mass

Given the balanced chemical equation:

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂? (express answer in 3 sig figs)

• 256 g of O_{2 are produced from the decomposition of 12 mol of NaClO3}

• 576 g of O₂ are produced from the decomposition of 12 mol of NaClO3

• 288 g O₂ are produced from the decomposition of 12 mol of NaClO3

How many grams of NH₃ are needed to react completely with 30.00 grams of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

• 12.00 grams of NO are needed to react completely with 30.00 grams of NO

• 11.35 grams of NH₃ are needed to react completely with 30.00 grams of NO

• 34.35 grams of NO are needed to react completely with 30.00 grams of NO

• 12.36 grams of NH₃ are needed to react completely with 30.00 grams of NO

Given the balanced chemical equation:

2Na + 2H₂O → 2NaOH+ H₂

How many grams of hydrogen gas (H₂) are produced if 120 g of Na are available? (express answer in 2 sig figs)

• 5.3 g of H₂

• 2.6 g of H₂

• 690 g of H₂

• 45 g of H₂

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

Tags

NGSS.HS-PS1-7