Percent error

Using your optimized expression for W, calculate the estimated total energy of each of these atoms and ions. Also calculate the percent error in your estimate for each ion. What physical reason explains the decrease in percentage error as Z increases ... 

To verify the method a 1.00-mL aliquot of a standard solution of 40.0-ppm glucose was added to 1.00 ml of the combined reagents, requiring 34.6 s to produce the same extent of reaction. Determine the calculated concentration of glucose in the standard and the percent error for the analysis. 

Errors in compressibihty factors tabulated for over 6500 data points rarely exceed 2 percent except in the critical region, where 15 percent errors may be expected and 50 percent errors can occur. For mixtures near the critical point, special techniques are available as discussed in the sixth chapter of the Technical Data Book. 

There are certain limitations on the range of usefulness of pitot tubes. With gases, the differential is very small at low velocities e.g., at 4.6 m/s (15.1 ft/s) the differential is only about 1.30 mm (0.051 in) of water (20°C) for air at 1 atm (20°C), which represents a lower hmit for 1 percent error even when one uses a micromanometer with a precision of 0.0254 mm (0.001 in) of water. Equation does not apply for Mach numbers greater than 0.7 because of the interference of shock waves. For supersonic flow, local Mac-h numbers can be calculated from a knowledge of the dynamic and true static pressures. The free stream Mach number (MJ) is defined as the ratio of the speed of the stream (V ) to the speed of sound in the free stream ... 

Figure 3. Graph of Percent of Compounds against Percent Error...

For either type pump, the bubble should stop between the 95 cc and 105 cc marks. Allow 4 minutes for the pump to draw the full amount of air. Also check the volume for 50 cc (1/2 pump stroke) and 25 cc (1/4 pump stroke) if pertinent. A +5 percent error is permissible. If error is greater than +8 percent, send the pump for repair and recalibration. Record the calibration information required on a calibration log. It may be necessary to clean or replace the rubber bung or tube holder if a large number of tubes have been taken with the pump. 

In carrying out a molar mass determination by freezing point depression, we must choose a solvent in which the solute is readily soluble. Usually, several such solvents are available. Of these, we tend to pick one that has the largest kf. This makes ATf large and thus reduces the percent error in the freezing point measurement From this point of view, cyclohexane or other organic solvents are better choices than water, because their kf values are larger. 

Most published studies relate only to isothermal experiments. Hence, in order to make such comparisons we modified our computations to assume isothermal conditions. Figure 11 compares our kinetic model with data by Hui and Hamielec for styrene thermal polymerization at 1A0°C. Figure 12 compares out kinetic model with data by Balke and Hamielec (7) for MMA at 90 C using 0.3 AIBN. Figure 13 compares our kinetic model with data by Lee and Turner ( ) for MMA at 70°C using 2% BPO. Our model compares quite favorably with these published experiments. The percent error was less than S% in most of the ranges of conversions. 

Grafted Davisil Expected Loading (mmol N/g) Experimental Results " (mmol N/g) Error (mmol N/g) Percent Error... 

What was the percent error in your value of Planck s constant List... 

State the equation used to determine percent error. 

Calculate the percent error of the experimental result using the actual... 

An interesting situation that arises often in engineering practice is when the errors have a constant, yet unknown, percent error for each variable, i.e. 

An erroneous a results in wrong estimates of air flow rate into the system, which may lead to a maximum of 10 percent error in heat release rate. 

VIII. Conclusions and/or Post-lab Summarize in a paragraph what the laboratory data showed. Include percent error(s) if possible. This is also a good area to include any statistical work comparing your work with class averages or expected/theoretical results. Some laboratory manuals include Post-Lab questions, which would be included here. 

What would be the theoretical percent of water in the hydrate and what was the percent error ... 

What was the percent error of the results compared to the actual molecular mass of 128 g moF1 ... 

Calculate the percent error between the measured AH and the calculated AH. 

Sensitivity requirement is the minimum weight required to move the pointer by one division on the scale. The smaller the weight required to move the pointer by one division, the more sensitive is the balance. Sensitivity requirement (SR) is related to the percent error or maximum potential error by the equation,... 

Percent error (%E) can also be figured by the formula given below ... 

If a pharmacist attempts to weigh 80 mg on a prescription balance with a sensitivity requirement of 4 mg, what is the percent error associated with the weighing ... 

A pharmacist measured 50 mL of syrup USP in a measuring cylinder, and transferred that amount to a beaker. To his surprise, he later observed that 5 mL of syrup USP was still left in the cylinder. What is the percent error in his syrup USP measurement ... 

If one attempts to weigh 150 mg of aspirin on a balance having a sensitivity requirement of 30 mg, what would be the percent error involved ... 

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