Chemistry Review - Chapter 9B

Find the empirical formula for the compound that contains 72.40% iron and 27.60% oxygen.

What is the percent composition of chlorine in the compound NaCl?

The mass of a sample of a hydrate of magnesium iodide MgI₂ is 1.628 g. It is heated until it is anhydrous and its mass is 1.072 g. Determine the formula for the hydrate.

Tags

NGSS.HS-PS1-7

Determine the number of moles of potassium ions that are in 2.5 moles of

potassium sulfide K₂S.

How many grams are in 2.385 moles of water?

What is the correct molar mass for the compound KCN?

Which term is described as the lowest whole-number ratio of elements in a compound?

hydrate

molecular formula

empirical formula

percent composition

What is the molar mass of gold?

Which term is described as the percent by mass of any element in a compound?

hydrate

molecular formula

empirical formula

percent composition

Which element has a molar mass of 30.974 g/mol?

potassium

phosphorus

gallium

palladium