Composition
What is the percent composition of lithium in lithium oxide (Li2O)?
Molar Mass of Li2O= 29.8g/mol
Percent Composition:46.3%
Given that a 95.2g sample contains 40.8g of carbon and 54.4g of Oxygen, determine the empirical formula.
Empirical Formula:
CO
What is the molecular formula for a compound with an empirical formula of C2OH4 and a molar mass of 44 g/mol.
Molecular Formula:
C2OH4
True or False
The molecular formula for a compound can be the same as or a multiple of the compound's empirical formula.
True!
When is the Unit 6 Exam?
Wednesday or Thursday next week
Calculate the percent composition of carbon in carbon dioxide (CO2).
Percent Composition: 27.27%
Calculate the empirical formula of a compound that is 85.6% Carbon, and 14.4% Hydrogen.
Correct Answer:
CH2
What is the molecular formula for a compound with an empirical formula of C4H4O and molar mass of 136 g/mol.
Molecular Formula:
C8H8O2
True or False:
The multiplication factor for empirical to molecular is found by dividing the empirical formula mass by the experimental molar mass
False!
Experimental / empirical
Your chemistry room number.
2222
Calculate the percent composition of phosphorus in magnesium phosphate Mg3(PO4)2.
Percent composition: 23.58%
Determine the Empirical Formula for a lactic acid that is 40.0% Carbon, 6.71% hydrogen, and 53.3% Oxygen.
Empirical Formula
CH2O
The empirical formula of a compound is CH2, its molar mass is 56 g/mol. Given this, find the molecular formula for this compound.
Molecular Formula:
C4H8
True or False:
Ms. Corrothers was a substitute before becoming a teacher.
True!
What university did Ms. Corrothers attend?
Mississippi University for Women
UTHealth
Calculate the percent composition of oxygen in magnesium hydroxide. Mg(OH)2
Percent Composition: 54.89%
Write the empirical for a compound that is 21.20% Nitrogen, 6.06% Hydrogen, 24.30% Sulfur, and 48.45% Oxygen.
Empirical Formula:
N2H8SO4
Find the molecular formula for a compound with an empirical formula of CFBrO and a molar mass of 254.7 g/mol.
Molecular Formula:
C2F2Br2O2
The formula for finding percent composition is:
(melement / mcompound) x 100%
True
How many siblings does Ms. Corrothers have?
3
Calculate the percent composition of both carbon and hydrogen in acetamide (C2H5NO).
Percent composition for C: 40.668%
Percent composition for H: 8.533%
A compound has 40.68% carbon, 5.12% hydrogen, and 54.20% oxygen. Calculate the empirical formula
Empirical Formula:
C2H3O2
What is the molecular formula of a compound containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen, and a molar mass of 110 grams/mole?
Molecular Formula: C6H6O2
True or False
The empirical formula will always be greater than the molecular formula.
False😮
When is the last day of school?
May 31st