Drill: Calculate the % composition of each element in H4N2O3

Return Tests & Review Drill & Test

4 H = 4.0 sum 2 N = 28.0 = 80.0 3 O = 48.0 % H = 4.0/80.0 x 100 % = 5.0% H % N = 28.0/80.0 x 100 % = 35.0 % N % O = 48.0/80.0 x 100 % = 60.0 % O

Name each of the following: CuO MnS SeO2 Na2O SnCl2 MnF2 HClO3 CCl4

Anyone who missed or failed the test may retake a similar test within a week to bring the grade up to 60.

Collect Labs

CHM II HW Review PP 06 Work the problems attached to Poly’s website.

Are there any questions on previous material?

Molar Conversions

The standard unit of measure for the amount of a substance Moles The standard unit of measure for the amount of a substance

Dozen = 12 of anything

Moles = 6.022 x 1023 of anything

= the amount of a substance that would = its mass in g from the PT Moles = the amount of a substance that would = its mass in g from the PT

Describe the factor label method of conversions

Molar Conversions Mass to moles Volume of a gas to moles Particles to moles Volume of a solution to moles

Atoms or molecules mass moles volume of a gas solution volume

Moles First

Mass to Moles Use atomic masses from the periodic table NaCl = 58.5 g/mole

Gas Volume to Moles At STP: 22.4 L/mole Non-STP: PV = nRT PV RT n =

Particles to Moles Use Avogadro’s Number 6.02 x 1023 atoms, molecules, etc/mole

Multiply molarity times volume n = M x V Soln Volume to Moles Multiply molarity times volume n = M x V

Solution Measures Molarity (M) = the number of moles of solute per liter of solution. Others later

Convert 7.0 g of silicon to moles

Convert 250 g of CaCO3 to moles

Convert 3.0 moles of helium to grams

Convert 11.2 L of oxygen gas at STP to moles

Convert 0.20 moles of helium to volume at STP

Convert: 2.0 x 1024 atoms He to moles

Drill: Convert 3.0 moles of glucose to molecules

Review & Collect Drill & HW

CHM II HW Review PP-6 Work the attached problem & turn it in on Monday We will have a lab on Friday.

Are there any questions on previous material?

Convert 250 mL of 0.10 M HCl to moles

6.8 g NH3 to volume of gas at STP Convert 6.8 g NH3 to volume of gas at STP

Drill: Determine the volume required to make 60. 0 g NaOH into a 0 Drill: Determine the volume required to make 60.0 g NaOH into a 0.75 M solution

Review & Collect Drill & HW

CHM II HW Review PP-6 Complete the attached assignment & turn it in tomorrow.

Are there any questions on previous material?

3.0 x 1025 molecules of CO2 to mass in kg Convert 3.0 x 1025 molecules of CO2 to mass in kg

Drill: Calculate the number molecules in 32 mg of Fe2O3

Calculate the number of atoms in 16 ng of Fe2(SO4)3

Empirical Formula

Lowest whole number ratio of elements in a compound C6H12O6: EF = CH2O

Determining Empirical formulas from percent composition

Assume 100 g Change % directly to grams Use molar conversions to convert grams to moles Divide each molar amount by the smallest molar amount

Find empirical for a compound with: 70.0 % Fe 30.0 % O

Find empirical for a compound with: 40 % Ca 12 % C 48 % O

Find empirical for a compound with: 40.0 % C 6.7 % H 53.3 % O

Molecular Formula

The actual whole number for each element in the compound

Molecular Formula C6H12O6 Empirical Formula CH2O

Solving MF from EF 1) Solve empirical mass 2) Divide EM into MM 3) Multiply EF by quotient

Drill: Calculate the mass of solute required to make 40. 0 mL of 0 Drill: Calculate the mass of solute required to make 40.0 mL of 0.25 M Pb(NO3)2

Test Review on Nomenclature, Molar conversions, & % Composition.

Calculate the % composition of each element in Pb(NO3)2

Calculate the empirical formula of a substance containing 62 Calculate the empirical formula of a substance containing 62.7 % Po, 28.8 % O, & 8.4 % N.

Calculate the molecular formula of a substance with an empirical formula of NH2 & a molecular mass of 32 g/mole.

Name each of the following: SeO MgS PbO2 Cl2O KNO3 ScCl3

Derive formulas for each: Cesium oxide Barium chloride Calcium phosphate Manganese(II) chlorate

Name each of the following: NH4Cl BaSO4 KC2H3O2 K2HPO3 KNO3 CuBrO Li2CO3 MgC2O4

Name each of the following: HCl H2SO4 H2S H3PO3 HNO3 HBrO H2CO3 HBrO4

Calculate the number of hydrogen atoms in 1.8 kg of PH5.

Calculate the volume at STP of 6.0 ng of NO.

Calculate the mass of KBr required to make 250 mL of a 0.40 M solution.