Molecular and Formula Mass

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

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

The mass of one mole of substance is called...

• molecular mass
• mole constant
• molar mass
• atomic weight

Tags

NGSS.HS-PS1-7

Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO_2. Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as synthetic product. What is the formula mass of the covalent compound silicon dioxide (SiO₂)?

• 7193.6 amu

• 30.0 amu

• 44.1 amu

• 60.1 amu

Fluorine is added to city water supplies in the proportion of about one part per million to help prevent tooth decay. Several fluoride compounds are added to toothpaste, also to help prevent tooth decay. What is the molar mass of fluorine gas?

• 18.998 amu

• 38 amu

• 9 amu

• 18 amu

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

Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner. What is the molar mass of NaOH?

• 40 amu

• 38.989 amu

• 23.998 amu

• 57.004 amu

What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)?

• 62.435g
• 116.399g
• 133.341g
• 97.888g

What is the molar mass of CO₂?

• 12
• 16
• 32
• 44

Tags

NGSS.HS-PS1-7

Potassium sulfide is the inorganic compound with the formula K₂S. Potassium sulfides are formed when black powder is burned and are important intermediates in many pyrotechnic effects, such as senko hanabi and some glitter formulations. What is the molar mass of K₂S?

• 110.3 amu

• 110 amu

• 78.2 amu

• 110.2 amu

What is the molar mass of Cs₂SO₄ ?

• 361.9

• 361.8

• 313.9

• 180