Recitation 6 - 3 III. 6.02 × 10 23 formula units of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CHEM 110 Recitation 6 1. Calculate the % C by mass in the following compound. 2A. A 7.0 g sample of a hydrocarbon (a molecule that has only hydrogen and carbon) is subject to combustion analysis. The mass of CO 2 collected is 22.0 g. What is the empirical formula of the compound? 2B. Using a mass spec, the mass of one molecule of this compound is determined to be 70 amu. What is the molecular formula of the compound? 3. What are the angles for the positions labeled on the molecule shown below? 4. Put the labeled angles in order of increasing bond angle. 5. A What is the mass (in grams) of 0.5 moles of benzene shown here? 5B: What is the mass of 2 moles of potassium phosphate? 5C. What is the molar mass of Prednisone if 0.125 moles weighs 44.8 g? 6. Put these in order of increasing number of atoms . I. 0.25 moles of Ca(NO 3 ) 2 II. 0.50 moles of KHCO
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 3 III. 6.02 × 10 23 formula units of ammonia chloride O C O C H H N H H H 1 2 3 C C C C C C H Cl H Cl H Cl C C C C C C C O O H H H H H H 1 2 3 C C C C C C H H H H H H CHEM 110 Recitation 6 7. Estrogen (estriol) is a steroid that has the formula C 18 H 24 O 3 . A. What is the mass of carbon in a 50 g sample of estrogen? B. How many moles of estrogen are in the 50 g sample? C. How many atoms are in a 3.0 mg sample of estrogen? 8. Alum used in cooking is a hydrate of potassium aluminum sulfate KAl(SO 4 ) 2 • x H 2 O. If 4.74g of alum is heated, the dehydrated compound that remains weighs 2.58g. What is the value of x in the formula for alum? 9. Fill out the table below for the molecules or ions given. (Be sure to draw the Lewis structures. Molecule or ion Electron Domain geometry Molecular geometry ICl 2 + ICl 3 IO 4 – I 3 – IF 5 IF 4 +...
View Full Document

This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

Page1 / 2

Recitation 6 - 3 III. 6.02 × 10 23 formula units of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online