mole concept

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

What is the total number of moles of CO₂ needed to make 2 moles of C₆H₁₂O₆?

• 2.5

• 6

• 12

• 15

Tags

NGSS.HS-LS2-5

NGSS.HS-PS1-7

2 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

• 32 g O₂

Tags

NGSS.HS-PS1-7

Calculate the % composition by mass of oxygen present in H₂SO₄.

• 16.3%
• 65.25%
• 32.6%
• 57.14%

Determine the number of
atoms in
2.50 moles of zinc.

• 1.51 x 10²⁴ atoms
• 4.15 x 10^-24 atoms
• 2.71 x 10^-22 atoms
• 163 atoms

Tags

NGSS.HS-PS1-7

A mole of carbon dioxide contains 6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles
• 0.8 moles
• 7,673.4 moles
• 150 moles

Tags

NGSS.HS-PS1-7

Convert 25 g of NaBr to molecules

• 102.96 molecules

• 0.24 molecules

• 1.45x10²³ molecules

• 2.34 x 10²⁰molecules

Tags

NGSS.HS-PS1-7

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

• 2, 6, 3, 2
• it is already balanced
• 4, 12, 3, 4
• 2, 1, 4, 5

Tags

NGSS.HS-PS1-7

How many conversion factors are needed to solve the problem?

How many formula units of MgO can be produced from 345 g of Mg?

2 Mg + O₂ → 2 MgO

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-7

XCO₃ ---------- XO + CO₂

The equation above shows the action of heat on the carbonate salt of metal X.

How many moles of XCO₃ are needed to produced 4.0 g of oxide X?

[Relative atomic mass: C, 12; O, 16; X, 64]

• 0.03

• 0.05

• 0.08

• 0.09

Tags

NGSS.HS-PS1-7