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The density of sodium borohydride is 1.492g*cm3. If 3.93 g of sodium borohydride contains 2.50*10^23 H atoms, Explain how many moles of H atoms are present in 28.0 cm3 of sodium borohydride?
Compute the difference in pressure between CH4 and an ideal gas if 14.0 moles of gas are in a 6.00 litres tank at the temperature of 21.1 degree celsius . The van der Waals constants for CH4 are a =2.300 L^2 x atm/mol ^2 and b=0.0430 L/mol.
How many grams of dry NH4Cl need to be added to 2.30 L of a 0.100 M solution of ammonia,NH3, to prepare a buffer solution that has a pH of 9.00
Write the complete ionic equation for the reaction that occurs when a few drops of HCl are added to the buffer.
A 29.7 g mixture of the compounds magnesium oxide and potassium chloride is 57.7 % by mass magnesium oxide. The compound potassium chloride is 47.6 % by mass chlorine. Calculate the mass (g) of potassium in the mixture.
helium gas at 25 oc filled a balloon to a volume of 2.25 l. what would the volume of this balloon be when cooled at
if 11.3g of Ca(NO3)2 dissolves in 115.0g of water, the freezing point is depressed by -3.34C. from this data, what is the molal freezing point depression of water
What mass of Ni metal can be produced by electrolysis from a solution of Ni2+ (aq) at a current of 15.0 amps for 1.00 hour
how much heat will be released when 6.44 grams of sulfer reacts with excess oxygen according to the following equation?
Consider the bonding in the following using valence bond theory. For which would dissH be the smallest
The conversion of cyclopropane, an anesthetic, to propylene has a rate constant k - 1.3x10?6 s?1 at 400°C and k = 1.1x10?5 s?1 at 430°C. a) What is the activation energy in kJ mol?1
In a study of alcohol dehydrogenase on alcohol at25.0 degrees Celcius, the concentration of ethanol in a first order reaction decreases from 15.0mmol/L to 5-0mmol/L in 2.5*10^4s. What is the rate constant for the reaction at 25.0 degrees C
Because of the movable plunger on a syringe, the gas inside the syringe can be held at a constant pressure of 1.00 atm while allowing the volume of the gas to increase or decrease.
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