[idonthateyou]

Can someone please help me with these questions. Doing WebAssign.net homework and I keep getting the wrong answer. Any help would be greatly appreciated.

1.  The Morgan silver dollar has a mass of 26.73 g. By law, it was required to contain 90.% silver, with the remainder being copper.
a.  When the coin was minted in the late 1800s, silver was worth $1.18 per troy ounce (31.1 g). At this price, what is the value of the silver in the silver dollar?
b.  Today, silver sells for about $13.25 per troy ounce. How many Morgan silver dollars are required to obtain $36.65 worth of pure silver?


2. A cylindrical rod formed from silicon is 17.0 cm long and has a mass of 2.13 kg. The density of silicon is 2.33 g/cm3. What is the diameter of the cylinder? (The volume of a cylinder is given by πr2h, where r is the radius, and h is its length.)

3.  Two students determine the percentage of lead in a sample as a laboratory exercise. The true percentage is 32.32%. The students' results for three determinations are as follows:
1. 32.28, 32.34, 32.31
 2. 32.44, 32.41, 32.38

 Precision can be judged by examining the average of the deviations from the average value for that data set. (Calculate the average value for each data set, then calculate the average value of the absolute deviations of each measurement from the average.) Which set is more precise to the hundredth place? ... Also which data set (1 or 2) is more precise.

4. A 25.54-g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.0 mL. The solid and toluene together weigh 50.25 g. The density of toluene at the temperature of the experiment is 0.864 g/mL. What is the density of the solid?


5. An 14.0 cm long cylindrical glass tube, sealed at one end is filled with ethanol. The mass of ethanol needed to fill the tube is found to be 9.58 g. The density of ethanol is 0.789 g/mL. Calculate the inner diameter of the tube in centimeters.







Any help would be greatly appreciated.

[sjb]

Can someone please help me with these questions. Doing WebAssign.net homework and I keep getting the wrong answer. Any help would be greatly appreciated.

1.  The Morgan silver dollar has a mass of 26.73 g. By law, it was required to contain 90.% silver, with the remainder being copper.
a.  When the coin was minted in the late 1800s, silver was worth $1.18 per troy ounce (31.1 g). At this price, what is the value of the silver in the silver dollar?
b.  Today, silver sells for about $13.25 per troy ounce. How many Morgan silver dollars are required to obtain $36.65 worth of pure silver?


2. A cylindrical rod formed from silicon is 17.0 cm long and has a mass of 2.13 kg. The density of silicon is 2.33 g/cm3. What is the diameter of the cylinder? (The volume of a cylinder is given by πr2h, where r is the radius, and h is its length.)

3.  Two students determine the percentage of lead in a sample as a laboratory exercise. The true percentage is 32.32%. The students' results for three determinations are as follows:
1. 32.28, 32.34, 32.31
 2. 32.44, 32.41, 32.38

 Precision can be judged by examining the average of the deviations from the average value for that data set. (Calculate the average value for each data set, then calculate the average value of the absolute deviations of each measurement from the average.) Which set is more precise to the hundredth place? ... Also which data set (1 or 2) is more precise.

4. A 25.54-g sample of a solid is placed in a flask. Toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.0 mL. The solid and toluene together weigh 50.25 g. The density of toluene at the temperature of the experiment is 0.864 g/mL. What is the density of the solid?


5. An 14.0 cm long cylindrical glass tube, sealed at one end is filled with ethanol. The mass of ethanol needed to fill the tube is found to be 9.58 g. The density of ethanol is 0.789 g/mL. Calculate the inner diameter of the tube in centimeters.







Any help would be greatly appreciated.

Without seeing your wrong answers, this is difficult. Forum rules ask that you show attempts to the questions. So for instance, for 1: What mass of this coin is silver?

[Vivid_One]

I will be happy to help if you can show us your work which led you to the incorrect answers.