chemistry

What is a mole?

• 6.022 x 10²³ particles of any substance

• A small burrowing animal

• A dark spot on your skin

• A spy

An element's molar mass can be found on what part of an element's entry on the periodic table?

• atomic number

• atomic mass

• group number

• it can't be found on the periodic table

Which of these elements has the highest molar mass?

• Hydrogen

• Iron

• Carbonate

• Cobalt

You have two sealed flasks. The first flask contains 22.99 grams of solid sodium (Na). The second flask contains 200.59 grams of liquid mercury (Hg). Which flask has more moles of the indicated substance?

• The first flask

• The second flask

• Neither.

Which of the following sets of coefficients correctly balances the above chemical equation?

__Pb(NO₃)₂ + __NaI ⟶

__NaNO₃ + __PbI₂

• 1:2:1:2

• 2:1:2:2

• 1:2:2:1

• 1:1:1:1

You have 2 moles of graphite (KC₈) in your pencil. How many grams of graphite are in your pencil?

• 135.19 g

• 270.37 g

• 67.59 g

• 134 g

How many grams of carbon dioxide are in 0.5 mol of carbon dioxide?

• 11 g

• 44.009 g

• 22.005 g

• 88.018 g

How many moles of Francium (Fr) are in 7.4 x 10²⁶ atoms?

• 1.23 moles

• 44.56 x 10⁴⁹ moles

• 87 moles

• 1.23 x 10³ moles Fr

How many Cl^- ions are found 2.00 mol of potassium chloride (KCl)

• 6.022 x 10²³

• 1.20 x 10²⁴

• 0.48

• 5.73 x 10²³

What percent of aluminum oxide is oxygen? Assume oxygen has a molar mass of 16 g/mol and aluminum has a molar mass of 27 g/mol

• 37%

• 47%

• 16%

• 60%