Moles, balancing equations, solutions and concentrations

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

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

How many potatoes are in one dozen potatoes?

• 10
• 12
• 2
• 6.02 x 10²³

How many atoms of iodine are in a mole of iodine?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³

Tags

NGSS.MS-PS1-1