Molar Mass

If we have one ​ (a)   of a compound such as platinum II chloride (PtCl₂), then we have 6.02x10²³ ​ (b)   of PtCl₂. To find the mass of this mole of PtCl₂, we need to find the mass of a mole of each atom in the ​ (c)   . We add these masses together to get the mass of a mole of PtCl₂. This is called a ​ (d)   .

• mole
• molecules
• chemical formula
• molar mass
• atom

The molar mass of an element is equal to its...

• Atomic mass
• Atomic number
• Oxidation number
• Valence electrons

Tags

NGSS.HS-PS1-7

What are the units of molar mass?

• grams

• moles

• mol/gram

• grams/mol

Tags

NGSS.HS-PS1-7

Which of the following statements is FALSE?

• Molar mass is the mass in grams of one mole of a substance.

• Molar mass is the sum of the number of all atoms in one molecule

• Molar mass is the sum of the masses of a mole of all the atoms in the molecule

• You don't need atomic mass when calculating molar mass

Place the steps of calculating the molar mass of a compound in the correct order.

• Multiply number of atoms of each element by the mass

• Write compound formula and list each element

• Count the number of each atom in the formula

• Get mass of each element from periodic table

• Add these values together for compound molar mass.

How do we calculate the molar mass of H₂O?

• 2(1.01) + 16 = 18.02

• 1.01 + 16 = 17.01

• 2(1.01) + 2(16) = 34.02

• 1.01 + 2(16) = 33.01

What is the molar mass of CO₂?

• 12 g/mol

• 16 g/mol

• 32 g/mol

• 44 g/mol

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol

Find the molar mass of KCl

• 36 g/mol
• 78 g/mol
• 74 g/mol
• 178 g/mol

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol