Exam1Spr11FormAwAns - CHM 2045 Exam 1 (Form Code A) Spring...

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

View Full Document Right Arrow Icon
CHM 2045 Exam 1 (Form Code A) Spring 2011 Instructions: On your scantron sheet enter and bubble in your name, UF ID number (start on the leftmost space and leave any extra spaces blank), and Form Code (see above) . You may retain your exam sheet (mark your answers on it and the scantron sheet) and any other sheets. Turn in only your scantron. Check your bubbling carefully – bubbling errors will not be negotiated . 1. How many carbon atoms are in 2.00 mL of acetonitrile (CH 3 CN) ? (density = 0.786 g/mL) (1) 1.15 x 10 22 C atoms (2) 2.31 x 10 22 C atoms (3) 4.61 x 10 22 C atoms (4) 1.38 x 10 23 C atoms (5) 6.02 x 10 23 C atoms 2. How many moles of K + ions are present in a solution prepared by mixing 150 mL of 0.250 M potassium bicarbonate with 350 mL of 0.400 M potassium sulfate? (1) 0.318 moles (2) 0.178 moles (3) 0.159 moles (4) 0.089 moles (5) 0.045 moles 3. How many moles of oxygen gas are required to combust one mole of dimethyl ether [(H 3 C) 2 O] and produce CO 2 and water as sole products? (1) 2.5 mols (2) 3.0 mols (3) 3.5 mols (4) 4.0 mols (5) 5.0 mols 4. A solution is formed by mixing 50.0 mL of 6.00 M H 2 SO 4 and 200.0 mL H 2 O. What is the molarity of H 2 SO 4 in the final solution? (1) 1.20 M (2) 1.27 M (3) 1.31 M (4) 1.42 M (5) 1.50 M 5. A 0.5438 g sample of a liquid consisting of only C, H, and O was burned in pure oxygen, and 1.039 g of CO 2 and 0.6369 g of H 2 O were obtained. What is the empirical formula of the compound ? (1) CH 2 O (2) C 2 H 6 O (3) C 2 H 5 O 2 (4) C 2 H 4 O (5) C 3 H 6 O 2 6. Ammonia gas reacts with oxygen gas to form nitrogen monoxide gas and water. How many grams of nitrogen monoxide gas can be produced if 30.0 g of ammonia were mixed with 40.0 g of oxygen gas ? (1)
Background image of page 1

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

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

This note was uploaded on 07/15/2011 for the course CHEM 2045 taught by Professor Gower during the Spring '11 term at University of Florida.

Page1 / 3

Exam1Spr11FormAwAns - CHM 2045 Exam 1 (Form Code A) Spring...

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