General Chemistry

A compound that contains only carbon, hydrogen, and oxygen is composed of 48.64% C and 43.2% O by mass. What is the empirical formula of this compound?

Elemental analysis of a sample of an ionic compound showed 2.82 g of Na, 4.35 g of Cl, and 7.83 g of O. What is the empirical formula of the compound?

A compound composed of carbon, hydrogen, and chlorine contains 4.19 x 10²³ hydrogen atoms. If 9.00 g of the compound also contains 55.0% chlorine by mass, what is the empirical formula?

Cortisol (MW = 362.47 g/mol), a known steroid hormone, is found to contain 69.6% carbon, 8.34% hydrogen, and 22.1% oxygen by mass. What is its molecular formula?

Elemental analysis of a pure compound indicated that the compound had 72.2% C, 8.50% H and the remainder as O. If 0.250 moles of the compound weighs 41.55 g, what is the molecular formula of the compound?

Valproic acid, used to treat seizures, is composed of carbon, hydrogen and oxygen. A 0.165 g sample is combusted to produce 0.166 grams of water and 0.403 grams of carbon dioxide. If the molar mass is 144 g/mol, what is the molecular formula?

When hydrocarbons are burned in a limited amount of air, both CO and CO₂ form. When 0.460 g of a hydrocarbon was burned in air, 0.477 g of CO, 0.749 g CO₂, and 0.460 g of H₂O were formed. What is the empirical formula of the compound?

If a compound made of calcium, carbon, nitrogen undergoes combustion in oxygen to create 2.389 g CaO, 1.876 g CO₂, and 3.921 g NO­₂, determine its empirical formula.

The combustion of 4.16 grams of a compound which contains only C,H,O and F yields 7.7 g CO₂ and 2.52 g H₂O. Another sample of the compound with a mass of 3.63 g is found to contain 0.58 g F. What is the empirical formula of the compound?

Give the systematic name for the following polyatomic ion.

NO₂^–

Give the systematic name for the following polyatomic ion.

CO₂^2–

Give the systematic name for the following polyatomic ion.

AsO₄^2–

The formula for the sulfate ion, SO₄^2–. If the term of “thio” means the replacement of an oxygen by a sulfur, what is the formula for the thiosulfate ion?

Give the systematic name for the following polyatomic ion.

FO^–

Give the systematic name for the following polyatomic ion.

IO₃^–

The silicate ion is the silicon version of the carbonate ion. Based on this description, provide the structure of the silicate ion.

Provide the name for the following compound:Al(BrO₄)₃

Provide the name for the following compound:CoCO₃

Provide the molecular formula for the following compound:Copper (I) nitrate

Provide the molecular formula for the following compound:Sodium dichromate

Give the systematic name from the given formula:K₂Cr₂O₇ ∙ 3 H₂O

Write the chemical formula for the following compound:Calcium selenide hexahydrate

Give the systematic name for the following compound:H₂S

Give the systematic name for the following compound:HCN

Write the formula for the following compound:Hypobromous acid  

Write the formula for the following compound:Cyanic acid

Give the systematic name for the following compound:SeF₆

Give the systematic name for the following compound:IO₅

Give the systematic name for the following compound:N₂S₄