S2 Unit 7 Week 1 Homework (Due 01-12-2024)

Front

What is the percent of oxygen by mass in a pure sample of FeC2O4?

Back

44%

Front

What is the correct formula for chromium(II) nitride?

Back

Cr3N2

Front

Which pair has the same empirical formula: NaCrO4 and Na2Cr2O7, or C2H4O2 and C6H12O6?

Back

C2H4O2 and C6H12O6

Front

What is the percentage by mass of fluorine in sulfur hexafluoride (SF6)?

Back

78.0%

Front

Find the mass percentage of water in ZnSO4·7 H2O.

Back

43.86%

Front

Define empirical formula.

Back

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

Front

What is the molecular formula of a compound?

Back

The actual number of atoms of each element in a molecule of the compound.

Front

How do you calculate the percent composition 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 molar mass of sulfur hexafluoride (SF6)?

Back

146.06 g/mol.

Front

What is the significance of the empirical formula in chemistry?

Back

It provides the simplest ratio of elements, which can help in determining the molecular formula.