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Calculate the mass of propylene glycol ({rm{C}}_3 {rm{H}}_8 {rm{O}}_2 ) that must be added to 0.340 kg of water to reduce the vapor pressure by 2.86 torr at 40 ^circ ,{rm C} (P_{{rm H}_2{rm O}} at 40 ^circ,{rm C} = 55.3;{rm torr}).
What is the identity of the metal if 0.280 grams of the metal is plated out in the electrolysis? Show all calculations.
What is methanol's vapor pressure It boils at 65.0 °C and has a heat of vaporization ΔHvap = 37.4 kJ/mol. at 22.0 °C?
how many grams of HNO3 must be dissolved to make 25L of a solution that has a pH of 1.5
Suppose a sample of solid hydrogen is held under an external pressure of 0.030 atm and heated from 5 to 300 K. What phase change(s), if any, will occur?
What is the equation for the reaction of cyclohexene wtih MnO4- to form 1,2-cyclohexanediol and MnO2 in a basic medium.
A gas sample containing N2 and O2 was found to contain 72% N2. If the pressure of the sample was 2.0 atm, what is the partial pressure of O2?
Calculate the amount of heat trasnferred when 3.55 g of Mg(s) reacts at constant pressure. 2Mg(s) + 02(g) ---> 2MgO(s) heat= -1204kJ
A container holds 355 mL of a mixture of nitrogen and carbon dioxide gases. Calculate the partial pressures of each gas if the container is at 27.3oC.
What is the molarity of a solution of 12.0 g of NH4Br in enough H2O to make 240 mL of solution?Answer in units of M.
how many moles of nitrogen are in 5.3 L container at 1.25 atm and a temp of 85 degrees C.
How many milliliters of 6 M HNO3 would you add to 300 mL of the buffers solution to change the pH from 5.09 to 5.03?
What is the speed of an electron ejected from a metallic surface, where the metal work function is 2.06 eV and the radiation is at the following wavelengths
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