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A 4.80 g nugget of pure gold absorbed 298 J of heat. What was the final temperature of the gold if the initial temperature was 24.0°C? The specific heat of gold is 0.129 J/(g·°C).
A 2.40-g sample of a large biomolecule was dissolved in 12.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolec
If, in a certain experiment, over a specific time period, 0.0045 mol PH3 is consumed in a 1.9 L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
It takes 49.0 to raise the temperature of an 8.00 piece of unknown metal from 13.0 to 24.5. What is the specific heat for the metal?
0.01M HCl reacts with 3.18 g Na2CO3. Here 50 mL of HCl is required for the reaction. Calculate the volume of CO2 produced at 273 K and 1 atm.
What volume of oxygen, measured at 0.891atm and 18 degrees Celsius is needed to burn completely 4.18L of butane measured at 1.34atm and 38 degrees celsius?
The heat of formation of liquid aluminum, Al (l) is about 10.7 kJ/mol. The entropy of solid aluminum is 28 J/mol K and the entropy of liquid aluminum is 40 J/mol K. Based on these data, at what tem
When a 5.00 g sample of NaOH dissolves in 100.0 g of water in a "coffee cup" calorimeter, the temperature rises from 28.3 degrees C to 39.6 degrees C. Calculate the heat energy for the reaction of 5
What is the percent yield of a reaction in which 262 g phosphorus trichloride reacts with excess water to form 102 g HCl and aqueous phosphorus acid (H3PO3)?
A 2.89 g sample of solid calcium carbide (CaC2) reacted with water to produce acetylene gas (C2H2) and aqueous calcium hydroxide. If the acetylene was collected over water at 16.3 C and 0.973 atm, h
What is the mol fraction Na2SO4 in a solution which is 11.5% by weight Na2SO4 (molar mass Na2SO4 = 142.06 g/mol and H2O = 18.016 g/mol)?
Magnesium hydroxide is 54.87% oxygen by mass. How many grams of oxygen are in 175g of the compound? how many moles of oxygen is this.
A + B unstable helix (fast, k1 and k-1) Unstable helix stable double helix (slow, k2). write pre-equilbrium and steady-sate approximation.
A solution of ethanol (C2H5OH) in water is prepared by dissolving 73.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 235.0 mL of solution. What is the molarity of the ethanol in this
How Many moles of CO2 when 15.5 ml of a 3.00 M HCI reacts with excess CaCO3? The calcium carbonate in limestone reacts with HCl to procduce a calcium chloride solution and carbon dioxide.
A 25.0 cm3 portion of this solution required 0.10 mol of NaOH for neutralisation. What is the number of moles of SO2Cl2 dissolved in water?
A concentration cell consists of two H2/H+ half cells. Half cell A has H2 at 0.87 atm bubbling into 0.10 M HCl. Half cell B has H2 at 0.45 atm bubbling into 2.2 M HCl. What is the voltage of the cel
Isotope 1 has a mass of 120.9038 {rm amu} and a relative abundance of 57.4%, and isotope 2 has a mass of 122.9041 {rm amu}. What is the atomic mass of this element?
What is the molarity of a solution of silver perchlorate, AgClO4, if 3.2 moles of silver perchlorate is dissolved in 1.5 liters of water? Is it 2.133 M, 4.756 M, 4.8 M, or 4.810 M ?
A compound is constituted by mass of 22.6% phosphorus, the rest being chlorine. Given that a volume of 307 mL of the gas has a mass of 1.55 g at 25 °C and 90 kPa, find the molecular formula for
Assuming that the specific heat capacity of the solution is 6.37J/degree celcius g and the density of the final solution is 2.00 g/mL, calculate the enthalpy change per mole of BaSO4 formed.
Ascorbic acid (vitamin C,c6h8o6) is a water-soluble vitamin. A solution containing 80.5 g of ascorbic acid dissolved in 200 g of water has a density of 1.22 g/ml at 55 c.
If 35.0 mL of NO2 gas is completely converted to N2O4 gas under the same conditions, what volume will the N2O4 occupy?
What is the concentration of N2 gas at equilibrium when the concentration of NO2 is three times the concentration of O2 gas.
Methane has a Henry's Law constant (k)of 9.88 × 10-2 mol/(L·atm) when dissolved in benzene at 25°C. How many grams of CH4 will dissolve in 3.00 L of benzene if the partial pressure