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Vitamin B2 tablet into a 250mL volumetric flask, diluted 25.00mL of this solution to a fresh 250mL volumetric flask. One mL of this solution was mixed with the reagents and brought to 10 mL and the absorbance was measured. The student ended up calculating that he/she has 2.19 ppm of Vitamin B2 in the diluted sample. Calculate the percent of the RDI of Riboflavin satisfied by consuming this tablet
H2C2O4(aq), Ka1 = 6.5 x 10-2 and Ka2 = 6.1 x 10-5. Don't forget that Kw = 1 x 10-14. Then Determine K for the reaction
A 2.41-L container is filled with 189 g argon. If the pressure is 10.0 atm, what is the temperature?
calculate the volume in mililiters (mL) of 6 M NaOH needed to make 500 mL of a 0.100 molar (M) NaOH solution.
Compute the activation energy for the flashing process. When At 29 o C the average rate is 3.3 flashes every 10 seconds; at 23 degree Celsius the average rate
A 1.20 sample of dry ice is added to a 745 mL flask containing nitrogen gas at a temperature of 25.0 C and a pressure of 735mmHg .
Calculate the total concentration of lead for a system containing a fixed concentration (0.01 M) of KI. Note (s) denotes solid and (aq) denotes aqueous
4 PH3(g) -> P4(g) + 6 H2(g) If, in a certain experiment, over a specific time period, 0.0039 mol PH3 is consumed in a 1.8 L container during each second of reaction.
N and H undergo a combination reaction under appropriate conditions, to yield ammonia: N2 (g) +3H2 (g) →2NH3 (g), determine how much sample of N2 in grams requires 3.0 g of H2 for complete reaction.
A 280ml flask contains pure helium at a pressure of 754 torr . A second flask with a volume of 475ml contains pure argon at a pressure of 732 torr . If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial..
Elements in the first short period are limited by the octect rule whereas those in the higher period can expand their valence shells. Describe what this means, account for this phenomenon and give an example of each.
Consider the following cell: Pt|H2(g, 0.645 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 1.20 V at 25 °C and the standard reduction potential of the Ag /Ag half-reaction couple is 0.80 V.
How much energy (in kilojoules) is required to convert 110 mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 ?
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