jlehman

jlehman

A bag of M&Ms is composed of 28% red M&Ms. How many M&Ms must be eaten in order to eat 35 red M&Ms? A bag of M&Ms is composed of 28% red M&Ms. How many M&Ms must be eaten in order to eat 35 red M&Ms?
How many seconds in 1.0 century? How many seconds in 1.0 century?
A 2.225 g sample of bronze (an alloy of tin and copper) is found to contain 0.684 g of tin (Sn). How many atoms of copper are in this sample of bronze? There are 6.021023 atoms of copper in 63.54 g of copper. A 2.225 g sample of bronze (an alloy of tin and copper) is found to contain 0.684 g of tin (Sn). How many atoms of copper are in this sample of bronze? There are 6.021023 atoms of copper in 63.54 g of copper.
A serving of Kelloggs Corn Flakes is 0.0892% K by mass. The USRDA for potassium is 6.0g. If one serving of corn flakes has a mass of 28.0g, and a volume of 1.0 cups, how many cups would need to be consumed in order to eat the recommended daily allowance of K? A serving of Kelloggs Corn Flakes is 0.0892% K by mass. The USRDA for potassium is 6.0g. If one serving of corn flakes has a mass of 28.0g, and a volume of 1.0 cups, how many cups would need to be consumed in order to eat the recommended daily allowance of K?
Water is composed of 88% oxygen by mass. In a 23.6 mL sample of H2O, how many hydrogen atoms are there? The density of water is 1.00 g/mL and there are 6.021023 atoms of hydrogen in 1.01 g of hydrogen. Water is composed of 88% oxygen by mass. In a 23.6 mL sample of H2O, how many hydrogen atoms are there? The density of water is 1.00 g/mL and there are 6.021023 atoms of hydrogen in 1.01 g of hydrogen.
A 300.0 mL beaker is filled with mercury. If the density of Hg is 13.6 g/mL, what is the mass of Hg in lb.? A 300.0 mL beaker is filled with mercury. If the density of Hg is 13.6 g/mL, what is the mass of Hg in lb.?
A 355 mL (12 fl oz.) can of Diet Dr. Pepper contains 55 mg of sodium (2% of the daily recommended allowance for sodium). How many gallons of Diet Dr. Pepper must be consumed in order to ingest 1.0 lb. of sodium? A 355 mL (12 fl oz.) can of Diet Dr. Pepper contains 55 mg of sodium (2% of the daily recommended allowance for sodium). How many gallons of Diet Dr. Pepper must be consumed in order to ingest 1.0 lb. of sodium?
An airplane travels at 800.0 mi./hr. How fast is this plane travelling in feet per second? An airplane travels at 800.0 mi./hr. How fast is this plane travelling in feet per second?
A 6.0% solution of KNO3 is composed of water (the solvent) and potassium nitrate (the solute). 356 g of this solution are placed in a beaker and heated until all of the water has evaporated. How many grams of potassium nitrate remain in the beaker? A 6.0% solution of KNO3 is composed of water (the solvent) and potassium nitrate (the solute). 356 g of this solution are placed in a beaker and heated until all of the water has evaporated. How many grams of potassium nitrate remain in the beaker?
Calculate the Kb of Acetate Ion Given the pH Calculate the Kb of Acetate Ion Given the pH
Calculate the Ka of Acetic Acid Given the pH Calculate the Ka of Acetic Acid Given the pH
2.55 g of aluminum and 8.35 g of chlorine gas are placed into a flask and the flask is quickly sealed. At the end of the reaction what is inside the container? Make sure that you write and balance the chemical equation. Be sure to explain your answer and show all work. 2.55 g of aluminum and 8.35 g of chlorine gas are placed into a flask and the flask is quickly sealed. At the end of the reaction what is inside the container? Make sure that you write and balance the chemical equation. Be sure to explain your answer and show all work.
How many grams of Ca are required to react with 12.0 g of oxygen to form CaO? How many grams of Ca are required to react with 12.0 g of oxygen to form CaO?
How many moles of CO2 are produced when 2.0 moles of C3H8 react with an excess of O2? Remember, the products of this reaction are CO2 and H2O. How many moles of CO2 are produced when 2.0 moles of C3H8 react with an excess of O2? Remember, the products of this reaction are CO2 and H2O.
How many grams of hydrogen gas are produced when 15.0 g of HI react with an excess of Mg? How many grams of hydrogen gas are produced when 15.0 g of HI react with an excess of Mg?
Using the data given in the previous problem, calculate the volume of 125 atoms of gold. Using the data given in the previous problem, calculate the volume of 125 atoms of gold.
A sample of gold occupies a volume of 25.2 mL. How many atoms of gold are there in this sample? The density of gold is 19.3 g/mL. A sample of gold occupies a volume of 25.2 mL. How many atoms of gold are there in this sample? The density of gold is 19.3 g/mL.
What is the mass of 175 atoms of tungsten? What is the mass of 175 atoms of tungsten?
How many atoms of Pb are there in 325 g of Pb? How many atoms of Pb are there in 325 g of Pb?
What is the mass of 2.65 moles of C? What is the mass of 2.65 moles of C?
How many moles of P is 4.2x10^18 atoms of P? How many moles of P is 4.2x10^18 atoms of P?
A Famous Star hamburger from Carl's Jr. is composed of 10.6% protein. The USRDA for protein is 60.0 g and one Famous Star has a mass of 244 g. Will one Famous Star provide the RDA for protein? How many Famous Star hamburgers would Eileen need to eat in order to get the USRDA for protein? A Famous Star hamburger from Carl's Jr. is composed of 10.6% protein. The USRDA for protein is 60.0 g and one Famous Star has a mass of 244 g. Will one Famous Star provide the RDA for protein? How many Famous Star hamburgers would Eileen need to eat in order to get the USRDA for protein?
The recommended intravenous dose for DOPRAM, a respiratory stimulant, is 0.75 mg/kg body weight. DOPRAM is sold as a solution that contains 20 mg per mL of solution. How many mL of DOPRAM solution are required to provide an adequate do to a 145 lb. person? The recommended intravenous dose for DOPRAM, a respiratory stimulant, is 0.75 mg/kg body weight. DOPRAM is sold as a solution that contains 20 mg per mL of solution. How many mL of DOPRAM solution are required to provide an adequate do to a 145 lb. person?
If gold costs $950.00 per ounce, and there are 6.021023 atoms of gold for every 197.0 g of gold, how many atoms of gold can be purchased for $10.00? If gold costs $950.00 per ounce, and there are 6.021023 atoms of gold for every 197.0 g of gold, how many atoms of gold can be purchased for $10.00?
A sugar solution is 8.0% sugar by mass. How many grams of water are there in 2.08 lb. of this solution? A sugar solution is 8.0% sugar by mass. How many grams of water are there in 2.08 lb. of this solution?
How many gal of Dr. P. to ingest 1.0 lb of Na? How many gal of Dr. P. to ingest 1.0 lb of Na?
How many mm in 1.5 mi? How many mm in 1.5 mi?
How many seconds does it take a car travelling 75MPH to go 350cm? How many seconds does it take a car travelling 75MPH to go 350cm?
A bullet travels 1000ft/s. How fast in MPH? A bullet travels 1000ft/s. How fast in MPH?
A Bag of M&M's composed of 28% red M&M's. How many to get 35 red M&M's? A Bag of M&M's composed of 28% red M&M's. How many to get 35 red M&M's?
A 300 mL beaker is filled with Al. What is the mass of Al? A 300 mL beaker is filled with Al. What is the mass of Al?
Is it worth driving 50 MPH to school instead of 35 MPH? Is it worth driving 50 MPH to school instead of 35 MPH?
How many seconds in 12 years? How many seconds in 12 years?
Pyrotechnics Pyrotechnics
In which part of the atmosphere can one find the ozone layer? In which part of the atmosphere can one find the ozone layer?
Two bottles, with identical mass (before being filled with gas) and volume are filled with helium. Bottle A is filled to a pressure of 810 torr, and bottle B is filled to 358 torr. Both bottles are at the same temperature. Which bottle weighs more? Explain your answer. Two bottles, with identical mass (before being filled with gas) and volume are filled with helium. Bottle A is filled to a pressure of 810 torr, and bottle B is filled to 358 torr. Both bottles are at the same temperature. Which bottle weighs more? Explain your answer.
812.0 g of sulfuric acid are placed with an excess of zinc in a sealed, evacuated 3.0 L flask. When the reaction is complete the temperature of the contents of the flask is found to be 29 C. What is the pressure of the gas in the flask? You will need a balanced chemical equation and you will need to use one of the gas laws that we discussed in order to answer this question. 812.0 g of sulfuric acid are placed with an excess of zinc in a sealed, evacuated 3.0 L flask. When the reaction is complete the temperature of the contents of the flask is found to be 29 C. What is the pressure of the gas in the flask? You will need a balanced chemical equation and you will need to use one of the gas laws that we discussed in order to answer this question.
25.0 g of oxygen react with 25.0 g of acetylene (C2H2). How many L of CO2 at 22C and 760 torr are formed? 25.0 g of oxygen react with 25.0 g of acetylene (C2H2). How many L of CO2 at 22C and 760 torr are formed?
In which part of the atmosphere does photochemical smog occur? In which part of the atmosphere does photochemical smog occur?
A sample of Ne at 550 torr and 25 deg C is placed in an evacuated 5.0 L flask. The gas sample is heated to 200 deg C. Assuming the volume of the flask does not change, what is the pressure of the gas inside the flask at the higher temperature? A sample of Ne at 550 torr and 25 deg C is placed in an evacuated 5.0 L flask. The gas sample is heated to 200 deg C. Assuming the volume of the flask does not change, what is the pressure of the gas inside the flask at the higher temperature?
A 25.0 L balloon is filled with N2O at 25 deg C and 800 torr. How many molecules of N2O ar ein the balloon? A 25.0 L balloon is filled with N2O at 25 deg C and 800 torr. How many molecules of N2O ar ein the balloon?
What is the volume of 1 mole of gas at STP? Calculate this to 3 significant figures. What is the volume of 1 mole of gas at STP? Calculate this to 3 significant figures.
A 5.0L sample of chlorine gas at 2.2 atm is compressed isothermally to a volume of 0.100L. What is the pressure of the gas at this volume? A 5.0L sample of chlorine gas at 2.2 atm is compressed isothermally to a volume of 0.100L. What is the pressure of the gas at this volume?
12.3g of NaOH are dissolved in enough water to prepare 1555 mL of solution. What is the pH of this solution? 12.3g of NaOH are dissolved in enough water to prepare 1555 mL of solution. What is the pH of this solution?
What volume of a 3.0M HNO3 solution is required to prepare 250mL of a 0.15M solution? What volume of a 3.0M HNO3 solution is required to prepare 250mL of a 0.15M solution?
6.2 mL of a 6.0M KOH soluiton is diluted to 50mL. What is the pH of the dilute solution? 6.2 mL of a 6.0M KOH soluiton is diluted to 50mL. What is the pH of the dilute solution?
What is the pH of a 0.050M HBr solution? What is the pH of a 0.050M HBr solution?
What is the [H+] and [OH-] of a 2.0M NaOH solution? What is the [H+] and [OH-] of a 2.0M NaOH solution?
6.20g of Na2S is dissolved in enough water to prepare 325 mL of solution. What is the molarity of this solution? 6.20g of Na2S is dissolved in enough water to prepare 325 mL of solution. What is the molarity of this solution?
How many mL of a 2.0 M HCl solution is required to react with 3.0g of Al? How many mL of a 2.0 M HCl solution is required to react with 3.0g of Al?
What mass of Zn is needed to react with 8.00 g of a 6.0% HCl solution? What mass of Zn is needed to react with 8.00 g of a 6.0% HCl solution?
What is the [H+] and [OH-] for a solution with a pH of 8.0? What is the [H+] and [OH-] for a solution with a pH of 8.0?
What is the [OH-] and [H+] for a 0.050M HBr solution? What is the [OH-] and [H+] for a 0.050M HBr solution?
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2.50 mL of a Na2S solution is diluted to 50 mL. What is the molarity of the dilute solution? 2.50 mL of a Na2S solution is diluted to 50 mL. What is the molarity of the dilute solution?
Calculate the % concentration of a KCl solution. Calculate the % concentration of a KCl solution.
How many mL of a solution with a pH of 0.50 would it take to neutralize 16 mL of a 0.100M LiOH solution? How many mL of a solution with a pH of 0.50 would it take to neutralize 16 mL of a 0.100M LiOH solution?
How many mL of 0.345 M H3PO4 is required to neutralize 125 mL of a 0.123 M KOH solution? How many mL of 0.345 M H3PO4 is required to neutralize 125 mL of a 0.123 M KOH solution?
20 mL of 3M HCl is mixed with 20 mL of 5 M NaOH. Will the resulting solution have a pH above 7, below 7, or 7? 20 mL of 3M HCl is mixed with 20 mL of 5 M NaOH. Will the resulting solution have a pH above 7, below 7, or 7?
Two NaOH solutions are reacted with HCl. Which solution is more concentrated? Two NaOH solutions are reacted with HCl. Which solution is more concentrated?
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Na2S solution is diluted to 50 mL. What is the dilute concentration? Na2S solution is diluted to 50 mL. What is the dilute concentration?
What volume of 3.0M HNO3 is required to prepare 250 mL of a 0.15M solution? What volume of 3.0M HNO3 is required to prepare 250 mL of a 0.15M solution?