Enter Title

Composition of compounds

100

Calculate the mass percent composition of carbon in CH₄

74.88%

200

Determine the number of moles of hydrogen atoms in 0.0885 mol C₄H₁₀

0.885 mol H atoms

300

Calculate the number of grams of sodium in 8.5 g of Na₃PO₄

3.6 g Na

400

How many kg of Cl. are in 25kg of CF₂Cl₂?

15 kg Cl

500

How many fluorine atoms are present in 5.85 g of C₂F4?

How many bromine atoms in 35.2 g CH₂Br₂?

1.41x10²³  F atoms 

2.44x10²³ Br atoms

Chemical formulas and experimental data

100

Calculate empirical formula 1.651 g Ag, 0.1224 g O

Ag₂O

200

Calculate empirical formula 2.128 g Be, 7.557 g S, 15.107 g O

BeSO₄

300

Find molecular formula

CCl / 284.77 g/mol

C₆Cl₆

400

Calculate molecular formula C₃H₂N/ 312.29 g/mol

C₁₈H₁₂N₆

500

Calculate molecular formula

C₄H₉/ 114.22g/mol

C₈H₁₈

Formula mass and mole concept

100

Calculate the formula mass for C₄H₁₀

180.16 amu

200

Calculate the number of moles in 72.5 g CCl₄

0.471 mol CCl₄

300

Calculate the number of moles in 12.4g of C₁₂H₂₂O₁₁

0.0362 mol C₁₂H₂₂O₁₁

400

How many molecules?n3.5 g H₂O and 26.9g C₈H₁₈

1.2x10²³ molecules H₂O

1.53x10²³ molecules C₈H₁₈

500

A salt crystal has a mass of 0.12mg. How many moles of Na⁺ are present in the crystal? How many moles of Na⁺ are present in the crystal?

2.0531x10^-6 mol Na⁺ and 2x10¹⁸ ions of Na ⁺

Nomenclature

100

Write the formula for the compound that forms between magnesium and sulfur

MgS

200

Mg₃N₂

magnesium nitride

300

CuNO₂ and KClO₃

copper (I) nitrite and potassium chlorate

400

copper (II) chloride and LiNO₂ * H₂O

CuCl₂ and lithium nitrite monohydrate

500

BeCl_{2 *} 2H₂O and chromium (III) phosphate trihydrate

beryllium chloride dihydrate and CrPO₄ *3H₂O