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When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 7.0 M HCl is required to react completely with 8.00 g of magnesium?
Ammonia can be decomposed to give 3 parts by mass of hydrogen and 14 parts by mass of nitrogen. What mass of nitrogen is obtained if 1.27g of ammonia is decomposed?
The rate constant for the first order decomposition of a compound A in the reaction 2A=P is k= 2.78*10-7|s at 25oc. what is the half- life of A?
An environmental chemist needs a carbonate buffer of pH 10.00 to study the effects of acid rain on limestonerich soils. How many grams of Na2CO3 must she add to 1.5 L of freshly prepared 0.20 M NaHC
The solubility of silver sulfate in water is 0.223% (w/v) at 35°C. Calculate the solubility product of this salt at this temperature.
Determine the mass of aluminum acetate that can be made if you do the reaction with 125 grams of acetic acid and 275 grams of aluminum hydroxide.
If 450 ml of some Pb(NO3)2 solution is mixed with 600 ml of 3.70 x 10-2 M NaCl solution, what is the maximum concentration of the Pb(NO3)2 solution added if no solid PbCl2 forms?
The electron in a hydrogen atom is excited and makes a transition from n=2 to n=7. Calculate the energy of the photon absorbed in joules. Calculate the wavelength of the photon in meters.
A toothpaste contains 0.24 by mass sodium fluoride used to prevent dental caries and 0.30 by mass triclosan. How many moles of are in the tube of toothpaste?
what mass of limestone must have dissolved if 3.05x10^10 kg of calcium hydrogen carbonate was produced?
What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 0.950 atm and 70 degrees C?
The heat of fusion of ice (the heat associated with ice melting) is 6.0kJ/mol . Find the temepature of the coffer after the ice melts.
iron has a density of 7.874 g/cm3. what is the mass of a rectangular block of iron with dimensions of 3.000 cm by 4.000 cm by 5.000 cm?
If the metal pellet has a heat capacity of 0.570 J/(g•ºC) and the water has a heat capacity of 4.184 J/(g•ºC), what is the final temperature of both the water and the metal pelle
A student combusts 504.96 grams of ethene gas, C2H4. How many liters of CO2 (g) are produced at a pressure of 0.993 atm and a temperature of 295 K? C2H4 (g) + 3 O2 (g) 2 -> CO2 (g) + 2 H2O (g)
During the titration several milliliters of deionized water are added to the Erlenmeyer flask containing the KHP solution. How will this affect the calculated concentration of NaOH (too high, too lo
Consider a situation in which 235g of P4 are exposed to 272g of O2. What is the maximum amount of P2O5 that can theoretically be made from 235g of P4 and excess oxygen?
Consider: C7H16 (l) + 11 O2 (g) → 7 CO2 (g) + 8 H2O (l) ΔH°reaction=- 4130 kJ. How much energy is released when 4.000 moles of C7H16, is combusted?
A student combusts 504.96 grams of ethene gas, C2H4. How many liters of CO2 (g) are produced at a pressure of 0.993 atm and a temperature of 295 K? C2H4 (g) + 3 O2 (g) -> 2 CO2 (g) + 2 H2O
Calculate the concentration of a monotropic basic solution, given that 99.3mL of the basic solution is neutralized by 83.0mL of a 0.0325M solution of HCl.
A student dissolves two moles of Mg(NO3)2 into a beaker of water. How many nitrate ions are present in the solution?
What is the total number of moles of Ca needed to react completely with 4.0 moles of H2O?
A sample of oxygen at 48 C occupies 622 mL.If this sample later occupies 1252 mL at 55 C and 1.4 atm, what was its original pressure? Answer in units of atm.
Determine the molar mass of chloroform gas if a sample weighing .389 grams is collected in a flask with a volume of 102cm cubed at 97 degrees Celsius. The pressure of the chloroform is 728 mmHg.
Sample of aluminum chloride increased in temperature by 3.5 K when the sample absorbed 167 J of energy. Calculate the number of moles of aluminum chloride in the sample. the C for aluminum chloride