Chemistry concepts and calculations

A 672 mg sample of impure sodium carbonate was titrated with 41.06 mL of 0.243 M

A 672 mg sample of impure sodium carbonate was titrated with 41.06 mL of 0.243 M hydrochloric acid. Calculate the percent mass of sodium carbonate in the sample.

A 672 mg sample of impure sodium carbonate was titrated with 41.06 mL of 0.243 M

A 672 mg sample of impure sodium carbonate was titrated with 41.06 mL of 0.243 M hydrochloric acid. Calculate the percent mass of sodium carbonate in the sample.

A 680 MW coal fired power plant is 34% efficient at producing electricity. The c

A 680 MW coal fired power plant is 34% efficient at producing electricity. The coal has a heating value of 20,000 kJ/kg, an ash content of 5.5% and a sulfur content of 4.5%. Note:…

A 69.0mL sample of 1.0 M NaOH is mixed with 58.0 mL of 1.0 M H2SO4 in a large St

A 69.0mL sample of 1.0 M NaOH is mixed with 58.0 mL of 1.0 M H2SO4 in a large Styrofoam cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temper…

A 7.30-L container holds a mixture of two gases at 47 °C. The partial pressures

A 7.30-L container holds a mixture of two gases at 47 °C. The partial pressures of gas A and gas B, respectively, are 0.298 atm and 0.568 atm. If 0.170 mol of a third gas is added…

A 7.55 mg sample of a weak base (FW - 144.44), pKa = 8.200, is dissolve in a 45.

A 7.55 mg sample of a weak base (FW - 144.44), pKa = 8.200, is dissolve in a 45.0 mL of a with a pH of 8.00. The resulting solution is extracted four (4) times with 10.00 mL of an…

A 7.69 g sample of HCN contains 0.285 g of H and 3.99 g of N. Part A Find the ma

A 7.69 g sample of HCN contains 0.285 g of H and 3.99 g of N. Part A Find the mass of carbon in a sample of HCN with a mass of 3.58 g . To analyze the experiment used to determine…

A 7.85-g sample of compound with empirical formula C_5H_4 is dissolved in 301g o

A 7.85-g sample of compound with empirical formula C_5H_4 is dissolved in 301g of benzene. The freezing point of the solution is 1.05 degree C below that of pure benzene (5.5 degr…

A 7.95 g sample of calcium sulfide was decomposed into its constituent elements,

A 7.95 g sample of calcium sulfide was decomposed into its constituent elements, producing 4.42 g of calcium and 3.53 g of sulfur. Which of the following statements are consistent…

A 7.97 gram piece of solid CO2 (dry ice) is allowed to sublime in a balloon. The

A 7.97 gram piece of solid CO2 (dry ice) is allowed to sublime in a balloon. The final volume of the balloon is 1.00 L at 299 K. What is the pressure of the gas? (A) 4.44 atm (B) …

A 70-kg person has a total blood volume of 5.0L. What volume (in mL) of 6.0 M HC

A 70-kg person has a total blood volume of 5.0L. What volume (in mL) of 6.0 M HCl could be neutralized by blood without the blood pH dropping below 7.0? Carbonic acid has a pKa of…

A 70.0mL sample of 1.0 M NaOH is mixed with 44.0 mL of 1.0 M H2SO4 in a large St

A 70.0mL sample of 1.0 M NaOH is mixed with 44.0 mL of 1.0 M H2SO4 in a large Styrofoam cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temper…

A 70.0mL sample of 1.0 M NaOH is mixed with 56.0 mL of 1.0 M H2SO4 in a large St

A 70.0mL sample of 1.0 M NaOH is mixed with 56.0 mL of 1.0 M H2SO4 in a large Styrofoam cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temper…

A 700 MW coal-fired power plant has a thermal efficiency of 35%. The coal has a

A 700 MW coal-fired power plant has a thermal efficiency of 35%. The coal has a heating value of 22,000 kJ/kg, an ash content of 5.5%, and a sulfur content of 3.8%. a.) What is th…

A 700 MW coal-fired power plant has a thermal efficiency of 35%. The coal has a

A 700 MW coal-fired power plant has a thermal efficiency of 35%. The coal has a heating value of 22,000 kJ/kg, an ash content of 5.5%, and a sulfur content of 3.8%. a.) What is th…

A 700 MW coal-fired power plant has a thermal efficiency of 35%. The coal has a

A 700 MW coal-fired power plant has a thermal efficiency of 35%. The coal has a heating value of 22,000 kJ/kg, an ash content of 5.5%, and a sulfur content of 3.8%. a.) What is th…

A 71.0 mL sample of 1.0 M NaOH is mixed with 49.0 mL of 1.0 M H_2SO_4 in a large

A 71.0 mL sample of 1.0 M NaOH is mixed with 49.0 mL of 1.0 M H_2SO_4 in a large Styrofoam coffee cup; the cud is fitted with a lid through which passes a calibrated thermometer. …

A 72 kg man stands on a spring scale in an elevator. Starting from rest, the ele

A 72 kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.2 m/s in 0.73 s. It travels with this constant spee…

A 72kg man stands on a spring scale in an elevator. Startingfrom rest, the eleva

A 72kg man stands on a spring scale in an elevator. Startingfrom rest, the elevator acsends, attaining its maximum speed of 1.2m/s in 0.80 s. The elevator travels with this consta…

A 73.0 mL sample of 1.0 M NaOH is mixed with 43.0 mL of 1.0 M H2SO4 in a large S

A 73.0 mL sample of 1.0 M NaOH is mixed with 43.0 mL of 1.0 M H2SO4 in a large Styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. Th…

A 73.0 mL sample of 1.0 M NaOH is mixed with 43.0 mL of 1.0 M H2SO4 in a large S

A 73.0 mL sample of 1.0 M NaOH is mixed with 43.0 mL of 1.0 M H2SO4 in a large Styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. Th…

A 73.8-g aluminum ice tray in a home refrigerator holds 323 g of water. Calculat

A 73.8-g aluminum ice tray in a home refrigerator holds 323 g of water. Calculate the energy in kJ that must be removed from the tray and its contents to reduce the temperature fr…

A 74-year-old male with a long-standing history of hypertension and coronary art

A 74-year-old male with a long-standing history of hypertension and coronary artery disease begins to exhibit personality changes, deterioration in personal hygiene and difficulty…

A 74.0 mL sample of 1.0 M NaOH is mixed with 48.0 ml. of 1.0 M H_2SO_4 in a larg

A 74.0 mL sample of 1.0 M NaOH is mixed with 48.0 ml. of 1.0 M H_2SO_4 in a large Styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer.…

A 74.6 g ice cube floats in the Artie Sea. The pressure and Temperatures of the

A 74.6 g ice cube floats in the Artie Sea. The pressure and Temperatures of the system and surroundings are at 1 atm and 0 degree C, receptively. Calculate Delta S_sys, Delta S_su…

A 75 L solution of 0.63 M Fe(NO3)3 is mixed with 89 mL of 0.33 M Ni(NO3)2. Ksp F

A 75 L solution of 0.63 M Fe(NO3)3 is mixed with 89 mL of 0.33 M Ni(NO3)2. Ksp Fe(OH)3=1.63x10^-39 and Ksp Ni(OH)2 = 6x10^-16 (a) If solid KOH is added to the solution, what will …

A 75 mL solution that is 0.10 M in HC_2H_3O_2 and 0.10 M in NaC_2H_3O_2 has a pH

A 75 mL solution that is 0.10 M in HC_2H_3O_2 and 0.10 M in NaC_2H_3O_2 has a pH of 4.74. Which of the following actions will change the pH of this solution? (I) Adding 15 mL of 0…

A 75,000 ft3 clarifier is to be used to treat wastewater. The recycle ratio is 5

A 75,000 ft3 clarifier is to be used to treat wastewater. The recycle ratio is 50%, the sludge volume index (SVI) is 125, and the return activated sludge concentration is 8000 mg/…

A 75.0 L steel tank at 20.0^degree C contains acetylene gas, C_2 H_2, at a press

A 75.0 L steel tank at 20.0^degree C contains acetylene gas, C_2 H_2, at a pressure of 1.39 atm. Assuming ideal V, T, P behavior, how many grams of acetylene am in the tank? 1650g…

A 75.0 mL sample of 1.00 M sodium bromide was reacted with50.8 mL of a 0.225 M l

A 75.0 mL sample of 1.00 M sodium bromide was reacted with50.8 mL of a 0.225 M lead (II) nitrate solution. a.) What type of reaction is this? b.) Give the net ionic equation for t…

A 75.0-mL volumeof0 200mol L^-1 NH, (K_b 1.8 times 10^-5)is titrated with 0.500

A 75.0-mL volumeof0 200mol L^-1 NH, (K_b 1.8 times 10^-5)is titrated with 0.500 mol L^-1 HNO_3. calculate the pH after the addition of 23.0ml of HNO_3 Express your answer numerica…

A 75kG PERSON DOING LIGHT WORK REQUIRES ABOUT 3000 kCALOFFOOD ENERGY PER DAY, 40

A 75kG PERSON DOING LIGHT WORK REQUIRES ABOUT 3000 kCALOFFOOD ENERGY PER DAY, 40% OF WHICH IS ACTUALY USED BY BODY CELLS.THE OTHER 60% IS LOST AS HEAT AND IN WASTE PRODUCTS.BEFORE…

A 76 pound flask of mercury cost $164.50. The Density of Mercury is 13.534 g/cm^

A 76 pound flask of mercury cost $164.50. The Density of Mercury is 13.534 g/cm^3. a) find the price of one cubic inch of mercury by calculating the following intermediate values.…

A 76.00 pound flask of mercury costs 129.50. The density of mercury is 13.534g/c

A 76.00 pound flask of mercury costs 129.50. The density of mercury is 13.534g/cm^3. A) Find the price of one cubic inch of mercury by calculating the following intermediate value…

A 76.00-pound flask of mercury costs $153.50. The density of mercury is 13.534 g

A 76.00-pound flask of mercury costs $153.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate valu…

A 76.00-pound flask of mercury costs $153.50. The density of mercury is 13.534 g

A 76.00-pound flask of mercury costs $153.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate valu…

A 76.00-pound flask of mercury costs $164.50. The density of mercury is 13.534 g

A 76.00-pound flask of mercury costs $164.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate valu…

A 77.7 -g aluminum ice tray in a home refrigerator holds 334 g of water. Calcula

A 77.7-g aluminum ice tray in a home refrigerator holds 334 g of water. Calculate the energy in kJ that must be removed from the tray and its contents to reduce the temperature fr…

A 78-year-old woman with a history of hypertension, aortic thoracic graft, and e

A 78-year-old woman with a history of hypertension, aortic thoracic graft, and esophageal reflux disease complained of fever (100 degree F) and weakness. She had been treated 3 we…

A 78.3-g aluminum ice tray in a home refrigerator holds 322 g of water. Calculat

A 78.3-g aluminum ice tray in a home refrigerator holds 322 g of water. Calculate the energy in kJ that must be removed from the tray and its contents to reduce the temperature fr…

A 7kb kg (m1) block rests on an inclined plane. The plane makes an angle of 20 d

A 7kb kg (m1) block rests on an inclined plane. The plane makes an angle of 20 degrees with the horizontal. The 7 kg block is tied to a second block (m2= 2 kg) which hangs over th…

A 8.13 g sample of 2,3,5-trimethylhexane (formula C9H20), is mixed with 26.05 at

A 8.13 g sample of 2,3,5-trimethylhexane (formula C9H20), is mixed with 26.05 atm of O2 in a 2.30 L combustion chamber at 374.49 °C. The combustion reaction to CO2 and H2O is init…

A 8.40 L container holds a mixture of two gases at 35°C. The partial pressures o

A 8.40 L container holds a mixture of two gases at 35°C. The partial pressures of gas A and gas B, respectively, are 0.194 ATM and 0.695 ATM. If 0.170 mol of a third gas is added …

A 8.50 L container holds a mixture of two gases at 11°C. The partial pressure of

A 8.50 L container holds a mixture of two gases at 11°C. The partial pressure of gas A and gas B, respectively, are 0.294 atm and 0.816atm. If 0.250 mil of a third gas is added wi…

A 8.80-g sample of homogentisic acid, a weak organic acid having ka=4.0 x 10^-5,

A 8.80-g sample of homogentisic acid, a weak organic acid having ka=4.0 x 10^-5, is dissolved in 25.00 ml of water and its pH is measured to be 2.039. What is the molar mass of ho…

A 80-kg halfback on a football team runs head-on into a 120-kg opponent at an in

A 80-kg halfback on a football team runs head-on into a 120-kg opponent at an instant when neither has his feet on the ground. The halfback is initially going west at 10 m/s , and…

A 810. mL balloon is purchased at 21.5 °C. It is then taken outside where the te

A 810. mL balloon is purchased at 21.5 °C. It is then taken outside where the temperature is -2.14 °C. How will the volume adjust if the pressure remains constant? A. What type of…

A 82.5g sample of a certain metal at 99.7 degrees C is added to 120.0g sample of

A 82.5g sample of a certain metal at 99.7 degrees C is added to 120.0g sample of water at 21.0 degrees celcius. After thermal equilibrium is established, the final temperature of …

A 82.8 g mixture of the compounds calcium sulfide (CaS) and magnesium bromide (M

A 82.8 g mixture of the compounds calcium sulfide (CaS) and magnesium bromide (MgBr2) is 12.6% by mass magnesium bromide . The compound magnesium bromide is 13.2% by mass magnesiu…

A 82.8 g mixture of the compounds calcium sulfide (CaS) and magnesium bromide (M

A 82.8 g mixture of the compounds calcium sulfide (CaS) and magnesium bromide (MgBr2) is 12.6% by mass magnesium bromide . The compound magnesium bromide is 13.2% by mass magnesiu…