OL Moles and Stoichiometry Review

How many grams are in 7.8 moles of NaCl?

• 476 grams

• 456 grams

• 452 grams

• 462 grams

Using the following equation:

Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of iron can be made from 6 moles H₂?

• 2 mol Fe

• 4 mol Fe

• 6 mol Fe

• 9 mol Fe

Tags

NGSS.HS-PS1-7

N₂ + 3H₂ → 2NH₃

How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 1

• 2

• 3

• 6

Tags

NGSS.HS-PS1-7

Calculate the number of particles (atoms) in 0.250 moles of silver.

• 1.62 x 10²⁵ atoms Ag

• 4.15 x 10^-25 atoms Ag

• 1.51 x10²³ atoms Ag

• 27.0 atoms Ag

Which has more atoms, 10.0 moles C or 10.0 moles Ca?

• C

• Ca

• The same

Which has more grams, 10.0 moles C or 10.0 moles Ca?

• C

• Ca

• The same

What is the empirical formula for C₆H₆O_2?

• C₃H₃O

• C₆H₆O₂

• CHO

• C₁₂H₁₂O₄

What is the percent composition of C in C₄H₁₀?

• 48.0%

• 58.0%

• 17.2%

• 82.8%

How many atoms(particles) are in 25.8 grams Hg?

• 3.12 x 10²⁷ atoms

• 7.74 x 10²² atoms

• 1.55 x 10²⁵ atoms

• 2.33 x 10²² atoms

Which of the following is 1 mole?

• 6.02 x 10²³ particles

• the molar mass (found on the periodic table)

• both of the above

• none of the above