Investigation 6 Exam

Front

What is the molar mass of AuCl3?

Back

303.3 g

Front

A compound consists of 72.2% magnesium and 27.8% nitrogen by mass. What is the empirical formula?

Back

Mg3N2

Front

What is the molecular formula if the empirical formula is C2H5 and the molecular molar mass is 58.14 g/mol?

Back

C4H10

Front

What is the mass % of H in methane (CH4)?

Back

25%

Front

What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g?

Back

K8S4O16

Front

Define molar mass.

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is an empirical formula?

Back

The simplest whole-number ratio of atoms of each element in a compound.

Front

How do you calculate the mass percent of an element in a compound?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formula shows the simplest ratio of elements, while molecular formula shows the actual number of atoms in a molecule.

Front

What is the molar mass of CH4?

Back

16 g/mol (C: 12 g/mol + H: 4 g/mol).