
Prob. 11 (20 pts.) A relic having a mass of 220 g is known to contain...
7. A mass of 140 g of a certain element is known to contain approximately 5.27 x 1024 atoms. What is the element? Chlorine Phosphorus Sulfur Nitrogen Silicon Argon Carbon Aluminum Oxygen
7. A mass of 130 g of a certain element is known to contain approximately 5.59 x 1024 atoms. What is the element? Sulfur O Aluminum Argon Phosphorus Nitrogen O Carbon Chlorine Silicon Oxygen
7. A mass of 130 g of a certain element is known to contain approximately 5.59 x 1024 atoms. What is the element? Sulfur O Aluminum Argon Phosphorus Nitrogen O Carbon Chlorine Silicon Oxygen
6. A mass of 135 g of an element is known to contain 3.01 × 1024 atoms. What is the element? 7. A young male adult takes in about 0.0005 m3 of fresh air during a normal breath. Fresh air contains approximately 21 % oxygen. Assuming that the pressure in the lungs is 100000 Pa, and air is an ideal gas at a temperature of 310 K, what is the number of oxygen molecules in a normal breath?
5.(16 pts, 8min) Do either (a) or (b) (a) A sample of Ar(g) having a mass of 0.0166 g is collected over water. If the temperature and total pressure of the system are 48.0°C and 676 mmHg respectively, what is the volume of the gas expressed in liters? Data: is 83.71 mmHg. R= 0.0821 L atm/(K mol), 1 atm 760 mmHg Atomic mass of Ar-39.95 and the vapor pressure of water at 48.0°C (b) Consider the following reaction: 2 NAOH(aq)+2...
Q2. (20 pts) 37.8 g of Y metal is allowed to react with 415 mL of an aqueous solution of HCl (d=1.088 g/mL) that contains 18.0% HCl by mass. Y() + HCl(aq) → YCl3(aq) + H2(g) (balance the reaction) a. What mass of H2(g) is produced? b. What mass of excess reactant remained at the end of this reaction? (Atomic weight of Y=26.98 g/mol, H=1.01g/mol, CI= 35.45 g/mol)
Q2. (20 pts) 37.8 g of Y metal is allowed to react with 415 mL of an aqueous solution of HCl (d=1.088 g/mL) that contains 18.0% HCl by mass. Y(s) + HCl(aq) → YCI,(aq) + H2(g) (balance the reaction) a. What mass of H.(g) is produced? b. What mass of excess reactant remained at the end of this reaction? (Atomic weight of Y=26.98 g/mol, H=1.01g/mol, CI= 35.45 g/mol)
a-c
5, Vinegar should contain more than 4% acetic acid (CHCOOH, molar mass 60.0 g mor) 25.0 mL of vinegar are diluted to 100.0 mL and 10.0 mL samples of this solution are titrated against 0.100 mol L-NaOH solution. An average of 18.1 mL NaOH are required to neutralize the vinegar. You will need to calculate the concentration of the diluted solution and hence the percentage concentration of acetic acid in the original vinegar via the following questions: CH COOH(aq)...
on 11 of 20 > A certain rifle bullet has a mass of 6.45 g. Calculate the de Broglie wavelength of the bullet traveling at 1721 miles per hour. Consult the table of physical constants as needed.
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à books.. mater als >< \D chapter 2, sector G. What is the comp ×) GThefigure below. × OBng x: loads/HWA-No5.pdf Problem 1(10 points) The figure below shows the phase diagram between silver (Ag) and mercury (Hg). A homogeneous mixture of these elements, with composition 60 wt% Ag-40 wt% Hg, is slowly cooled from 9000, down to room temperature. At what temperature do the first crystals form? 1. What is the composition of the...