#32 A compound is formed when 9.03 grams Mg combines with

Slides:

Advertisements

Similar presentations

Chapter 10 NOTES PRACTICE PROBLEMS.

Advertisements

Section Percent Composition and Chemical Formulas

AP Equations Question 4 Molar Mass and % Composition Chapter 3, Part 1.

Chem Catalyst 1) How many grams does 3.24 mol of carbon weigh? 2) How many particles are in 3.24 mol of carbon dioxide?

A 28. 0g Sample of nitrogen gas combines completely with 6

Percent Composition and Empirical Formula

a. sulfur in 3.54 g H2S % comp. S is: 32.1 x 100 = 94.1% 34.1

% X = (total atomic mass of X / molar mass which contains X)

01/06/11. What is the Molar Mass of the following: Calcium Sodium Oxygen TURN AND TALK Chat with your neighbors about the following questions? What.

Calculating Percent Composition Mrs. Page 10 th Chemistry.

Percent Composition From a Chemical Formula Chemistry 11 Ms. McGrath.

Percent Composition What is percent composition? How do I relate percent composition to counting concepts? How do I calculate percent composition?

Percent Composition. What is Percent Composition?  The percent composition by mass of a compound represents the percent that each element in a compound.

Percent Composition and Chemical Formulas

Formula Mass and Composition of Compounds

Chapter 10: Chemical Quantities

“Percent Composition and Chemical Formulas”

Percent Composition of Compounds & Empirical Formulas An Introduction to Analytical Chemistry Packet #21.

The Mole AA. Review Must turn in your packet with notes stapled to it before you can take the test.

Percent Composition  The percent by mass of an element in a compound is the number of grams of the element divided by the mass in grams of the compound.

1 Percent Composition Honors Chemistry. 2 n n The relative amounts of each element in a compound are expressed as the percent composition, which is the.

Chemistry Dr. Davis. A. Percent Composition: the percentage by mass of each element in a compound 1. Looking at the formula for FeO, we might assume the.

Percent Composition. HW – Ques. 7.1 Find the mass of each of the following: a.0.50 mole of NaOH b.4.5 moles of CaCO 3 c.0.25 mole of Ba(NO 3 ) 2 d.3.00.

Chem Catalyst If a class of 22 students has 15 girls and 7 boys, what percentage of the class is male? What percentage is female?

Percent Composition Percent Composition – the percentage by mass of each element in a compound Percent = _______ Part Whole x 100% Percent composition.

Molar Mass Practice Calculate the molar mass of the following: Hydrogen Fe Iron II sulfate.

Section 7.3 Percent Composition of a Compound Here’s were the math starts to get fun!!!

7.1 and 7.2 Review Calculate the mass in grams of 3.42 x molecules of NaCl. Calculate the volume occupied by 100g of water vapor (H 2 O)

Math in Chemistry.

THE MOLE Chapter 10: Chemical Quantities Measuring Matter What is a mole? It is the SI unit that measures the amount of substance.

Review Molar relationship and Molar conversion problems.

Percent Composition. What is it? The percent composition by mass of a compound represents the percent that each element in a compound contributes to the.

Percentage Composition (page 118).  The Law of Definite Composition deals with COMPOUNDS. This law states that the composition of any pure compound is.

Percentage Composition

7.1 and 7.2 Review Calculate the mass in grams of 3.42 x molecules of NaCl. Calculate the volume occupied by 100g of water vapor (H 2 O)

Percent Composition Percent by mass of an element in a compound.

Math in Chemistry. Percent Composition Purpose: Can be used to figure out chemical formulas.

PERCENT COMPOSITION X 100= % mass of element mass of element mass of compound.

Mass % and % Composition Mass % = grams of element grams of compound X 100 % 8.20 g of Mg combines with 5.40 g of O to form a compound. What is the mass.

In chemistry the unit we use to measure the “amount of a substance” is the mole The mole can be related to the # of particles (molecules or atoms), the.

Chapter 10 – Chemical Quantities Jennie L. Borders.

Emperical and Molecular Formulas. If I have 78.5 L of O 2 gas at STP, how many grams would that be? How many molecules would be present? How many atoms.

Percentage composition Indicates the relative amount of each element present in a compound.

Section 6.2 Molar Mass and Percent Composition 1.To understand the definition of molar mass 2.To learn to convert between moles and mass 3.To learn to.

Molecular Weight, Percent Composition, Empirical Formula.

Warm Up: Jan. 5 th –This is Ch. 7.4 notes –Give the oxidation numbers for the following atoms 1.NaPO 4 2.HClO 3 3.C 6 H 12 O 6.

Calculating Empirical Formulas

Chapter Three Mass Relationships in Chemical Reactions.

Percent Composition. Percent Composition – the percentage by mass of each element in a compound Percent = _______ Part Whole x 100% Percent composition.

WHITEBOARD PRACTICE TEST REVIEW. How many molecules of ethane, C 2 H 6 are present in g C 2 H 6 ?

Jeopardy Empirical Formulas Molecular Formulas Nomenclature Hydrates

Percent Composition.

Aim: How to calculate Percent Composition

PERCENT COMPOSITION CHAPTER 7-3.

Percent Composition Calculations

10.3 Percent Composition Def: Relative amounts of the different elements in a compound What percent of water is hydrogen? oxygen?

– the percent by mass of each element in a compound.

Percent Composition.

% Formula Mass and % Composition

Vocabulary Percent Composition -

Ch. 7-3 Percent Composition

Percentage Composition

10.3 Percent Composition and Empirical Formula

Created by: Miss K. Marshall

Percent Composition.

Empirical, molecular, percent composition

Percentage Composition

PERCENT COMPOSITION used to determine the formula of a compound

Chapter 10 – Chemical Quantities

Presentation transcript:

#32 A compound is formed when 9.03 grams Mg combines with 3.48 grams N. What is the percent composition of this compound? The total weight is: 9.03 + 3.48 = 12.51 The percentage of Mg is: 9.03 x 100 = 72.2 % 12.51 The percentage of N is: 3.48 x 100 = 27.8 % 12.51

#33 When a 14.2 g sample of mercury (II) oxide is decomposed into its elements by heating, 13.2 g Hg is obtained. What is the percent composition of the compound? The total weight is: 14.2 grams The percentage of Hg is: 13.2 x 100 = 93.0 % 14.2 The percentage of O is: 1.0 x 100 = 7.0 % 14.2 The difference between the beginning and end weight is the oxygen

#34 Calculate the percent composition of these compounds. a. ethane (C2H6) The total molar mass of ethane is: (12.0 x 2) + (1.0 x 6) 30.0 g/mole The percentage of C is: 24.0 x 100 = 80.0% 30.0 The percentage of H is: 6.0 x 100 = 20.0 % 30.0

120.1 120.1 120.1 120.1 #34 Calculate the percent composition of these compounds. b. sodium bisulfate (NaHSO4) The total molar mass of (NaHSO4 is: 23.0 + 1.0+ 32.1 +(16.0 x 4)= 120.1 g/mole The percentage of Na is: 23.0 x 100 = 19.2% 120.1 The percentage of H is: 1.0 x 100 = .83% 120.1 The percentage of S is: 32.1 x 100 = 26.7 % 120.1 The percentage of O is: 64.0 x 100 = 53.3 % 120.1

17.0 80.0 #35 Calculate the percent nitrogen in these fertilizers. a. NH3 The total molar mass of (NH3 is: 14.0 + (1.0 x 3)= 17.0 g/mole The percentage of N is: 14.0 x 100 = 82.4% 17.0 b. NH4NO3 The total molar mass of NH4NO3 is: 14.0+(1.0 x 4)+14+(16 x 3)= 80.0 g/mole The percentage of N is: 28.0 x 100 = 35.0 % 80.0 Two nitrogens