89For the following questions, Perform the operationan express your answer in scientific notation withthe correct number of significant figures. Do NOTput its unit in your answer because its unit is shownalready in the questions.0.523 moles x 0.821 L-atm/mol·K × 298 K/2.9 L =atmType your answer...1 pointFor the following questions, Perform the operationan express your answer in scientific notation withthe correct number of significant figures.2.345/45123 + 0.23 × 43.5 =Type your answer...1 pointFor the following questions, Perform the operationan express your answer in scientific notation withthe correct number of significant figures. Do NOTput its unit in your answer because its unit is shownalready in the questions.12 donuts/dozen X 59,362 dozen=donutType your answer... For the following questions, Perform the operationan express your answer in scientific notation withthe correct number of significant figures. Do NOTput its unit in your answer because its unit is shownalready in the questions.8.3 lb = how many g? (hint: 16 oz = 1 lb, 28.35 g =1 oz)Type your answer....

7)When multiplying and dividing, the answer should have the same number of significant figures as…

Answered: 8 9 For the following questions,…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Knowing that 1 calorie = 4.184 joules and 1kWh = 3.6 x 106 Joules, convert the following: 2739 teraWh into nanocalories.
Gaseous ethane (CH,CH,) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H,O). Suppose 0.601 g of ethane is mixed with 2.9 g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits. g x10 ?
Convert (1.3390x10^24) molecules of acetic acid, HC2H3O2 (OR "H" C2 H3 O2) to grams of acetic acid. Avogadro's Number is (6.022x10^23). You must enter your answer in scientific notation. For example, 25 would be expressed as 2.5x10^1. Note: Your answer is assumed to be reduced to the highest power possible.
Two identical balloons are filled to the same volume, one with air and one with helium. The next day, the volume of the air-filled balloon has decreased by 4.5 %. By what percent has the volume of the helium-filled balloon decreased? (Assume that the air is four-fifths nitrogen and one-fifth oxygen, and that the temperature did not change.) Express your answer using two significant figures.
Round your answers to the correct number of significant figures. Only use numbers in your answer. By what factor is the average kinetic energy of the particles in a substance increased if the temperature is raised from -173oC to 127oC?
A student determines the molar mass of a liquid unknown by the method used in this experiment. She found that the equilibrum temperature of a mixture of ice and water was 1.0 degrees C on her thermometer. When she added 11.1 g of her unknown sample to the mixture, the temperature, after thorough stirring, fell to -3.0 degrees C. She then poured off the solution through a screen into a beaker. The mass of the solution was 90.4 g. Kf=1.86 degrees C/m How much water was in the decanted solution? What did she find to be the molar mass of the unknown liquid, assuming she made the calculation properly?
A metal bar weighs 195 lbs. If the bar is 72% iron, 18% chromium, and 10% nickel, what is the weight of iron (in g) in the bar?
Asking for Q 9
(CONTINUED ON NEXT PAGE) 4. Let's say that the full volume of your flask is 325 ml. You heat the flask of air in a hot water bath at 89.0°C according to your thermometer. You then inverti into the cold water bath at 5.0°C Water enters the flask as the volume of the gas shrinks. a) Theoretically, what should the volume of the gas be after it sits in the cold water bath? b) You find that during your experiment that 65.0 mL of water has entered the flask. What is the experimental volume of the gas? c) What is your percent error for this measurement?
An organic chemist measures the temperature T of a solution in a reaction flask. Here is the result. T=56. °C Convert T to SI units. Round your answer to 0 decimal places. OK |x10
A metal bar weighs 189 lbs. If the bar is 72% iron, 18% chromium, and 10% nickel, what is the weight of iron (in g) in the bar?
A chemist prepares a solution of silver perchlorate (AgClO,) by weighing out 2.40 kg of silver perchlorate into a 500. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in g/dL of the chemist's silver perchlorate solution. Be sure your answer has the correct number of significant digits. x10 đL

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