S1-Q8-unit 2 all

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2
• 4
• 6
• 8

Tags

NGSS.HS-PS1-7

For the Balanced Reaction: 3 Mg + 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

2 KClO₃ → 2 KCl + 3 O₂

How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol

• 5.1 mol

• 10.05 mol

• 4.5 mol

2Na + 2H₂O → 2NaOH+ H₂

How many grams of hydrogen are produced if 230g of Na are available? [H=1; Na=23]

• 10 g

• 46 g

• 690 g

• 45 g

SiO₂ + 3C → SiC + 2CO

I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weight?

[C=12; O=16]

• _{96 g}

• 0.67 g

• 2.67 g

• 48 g

CH₄ + 2 O₂ → CO₂ + 2 H₂O

How many moles of carbon dioxide are produced from the combustion of 110 g of CH₄?

[H=1; O=16; C=12]

• 13.7 mol

• 2.75 mol

• 6.11 mol

• 6.875 mol

How many particles are in 13.5 grams of Beryllium? [Be=9]

• 1.5 particles

• 9 particles

• 4x10²³ particles

• 9.03x10²³ particles

2CO + O₂ −-> 2CO₂

How many liters of carbon dioxide are produced from 224 g of carbon monoxide?

• 10 L

• 44.8 L

• 179..2 L

• 88 gm

4 Al + 3 O₂ –> 2 Al₂O₃

if 60 moles of each reactant react together so which will be the limiting reactant ?

• there will be no limiting reactant

• both are limiting reactants

• Oxygen

• Aluminum

What is the percent by mass of oxygen in MgO?

[Mg=24; O=16]

• 20%

• 40%

• 50%

• 60%