Stoichiometry Test

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

Tags

NGSS.HS-PS1-7

For the reaction represented by the equation Cl₂ + 2KBr → Br₂ + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?

• 749 g

• 225 g

• 479 g

• 814 g

Tags

NGSS.HS-PS1-7

How many grams of H₂O can be produced from 3.91 g of O₂?

• 1.905

• 4.4

• 2.2

• 1.1

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2Na + 2H₂O = 2NaOH + H₂ if you react 50.0 grams of sodium, how many grams of water are needed.

• 25.0

• 39.2

• 46.7

• 50.0

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many grams are in 7.8 moles of NaCl?

• 476grams

• 460 grams

• 452 grams

• 462 grams

Tags

NGSS.HS-PS1-7

How many moles are in 19.82 g Mg? 

• 1.226mol Mg

• 481.7mol Mg

• 1.000mol Mg

•  0.82 mol Mg

How many particles are in a mole?

• 602

• 602 million

• 602 moles

• 6.02 x 10²³

Balance this reaction: ____ RbNO₃ + ____ BeF₂ ----> ____ Be(NO₃)₂ + ____ RbF

• 1,1,1,1

• 1,2,1,1

• 2,1,1,2

• 2,1,2,1

Tags

NGSS.HS-PS1-7

SiO₂ + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?

• _{96 g}

• 0.67 g

• 2.67 g

• 48 g

Tags

NGSS.MS-PS1-5

How many grams are in 1 mole of O₂?

• 8

• 16

• 24

• 32