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A 11.7 mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4.000?
A gas is heated from 268 K to 290 K while its volume is increased from 25.0 L to 37.0 L by moving a large piston within a cylinder. If the original pressure was 0.90 atm, what would be the final pre
A 55.0 gram piece of ice at 0.0 C is added to a sample of water at 8.0 C. All of the ice melts and the temperature of the water decreases to 0.0 C. How many kilograms of water were in the sample?
What mass of this substance must evaporate in order to freeze 119 of water initially at 24? (The heat of fusion of water is 334 the specific heat of water is 4.18 .)
What would happen if a solid was dissolved in a liquid at 100 degrees and then the temperature dropped to 70 degrees?
The lethal inhalation does of sarin for a 200lb person has been determined to be 0.0015 mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation does.
Calculate the mass of solid AgNO3 that can be added to 2.0L of a 0.10 M K2CrO4 solution in order to just start precipitation.
Making ice cream involves surrounding the ice cream canister with a bath of salted ice water. To get the mix to freeze at 7.00ºC, how many grams of salt (NaCl; molar mass = 58) will you need t
A rigid container of O2 has a pressure of 340 kPa at a temperature of 713 K. What is the pressure at 273 K?
Sodium benzoate (C6H5COONa) is used as a food preservative. Calculate the pH of a 0.050 M solution of this salt. Ka for benzoic acid is 6.5 x 10-5
Suppose you wanted to heat a mug of water (250 mL) from room temperature 25 C to 100 C to make a cup of tea. How much energy (in units of calories and joules) would you need from your microwave?
using percent yield, how many grams of Aluminium must be used to react with an excess of hydrogen phosphate to produce 35.8g of aluminum phosphate?
Calculate the amount of heat required to completely sublime 34.0g of solid dry ice at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3KJ/mol .
a 150 ml buffer solution containing 0.100 M hydrocyanic acid (HCN ka=6.2 x 10^-10) and .100 M soudium cyanide (NaCN) has 30.0 mL of .120 M KOH added to it. What is the pH of the solution after the
What is the molecular mass of vanilla (c8 h8 03)?
A piece of metal with a mass of 151 g is placed in a 50 mL graduated cylinder. The water level rises from 20. mL to 35 mL. What is the density of the metal?
Hydrochloric acid reacts with aluminum to form aluminum chloride and gseous hydrogen. What's the mass of aluminum required to produce 1.0kg of aluminum chloride if there is excess acid?
Which is amajor source of air pollution and a substantialcontributor to acid rain. What mass of Fe2O3 is produced from 85 L of oxygen at 3.73 atm and 143 C with an excess of iron pyrite?
Calculate the energy levels of the π-netwrok in octatetraene, C8H10, using the particle in the box model. To, calculate the box length, assume that the molecule is linear and use the values 135
a sample of H20 with a mass of 46.0 grams has a temperature of -58.0 degrees Ceslius. How many joules of energy are necessary to heat the steam from 100.0 degrees celsius to 114.0 degrees if the spe
The solubility of O2(g) in water is 4.43 mg of O2/100g H2O at 20oC and 1 atm pressure. What pressure of O2(g) would be required to produce a saturated solution that is 0.010 M O2?
When 0.250 mol of CH4(g) reacts with excess Cl2(g) at constant presure according to the chemical equation shown bellow, 177 kJ of heat are realesed. caculate the value of change of heat for this re
What are the partial pressures of CCl4 and Cl2 at equilibrium?
What is the final temperature of the water after the preceding reaction occurs? Assume that all the heat is used to raise the temperature of the water.
In the formula sodium phosphate (Na3PO4) how many moles of sodium are represented? How many moles of phosphorus? How many moles of oxygen?