Stoichiometry Pre Test

NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g) 
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂

• 576 g of O₂

• 288 g O₂

In a chemical reaction, the mass of reactants ___.

• is less than the mass of products

• is greater than the mass of products

• has no relationship to the mass of products

• is equal to the mass of products

Tags

NGSS.HS-PS1-7

___KNO₃ → ___KNO₂ + ___O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

2H₂ + O₂ = 2H₂O, If you react 3.0 moles of hydrogen, how many moles of oxygen are needed?

• 1 mole

• 1.5 moles

• 2.0 moles

• 2.5 moles

Tags

NGSS.MS-PS1-5

The __________ in a balanced equation reveals the mole ratios of the substances involved.

• subscript

• coefficients

• superscript

• total number in each compound

Tags

NGSS.HS-PS1-7

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

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.HS-PS1-7

How many grams are in 7.8 moles of NaCl?

• 476grams

• 460 grams

• 452 grams

• 462 grams

How many moles are in 19.82 g Mg? 

• 1.226mol Mg

• 481.7mol Mg

• 1.000mol Mg

•  0.82 mol Mg