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To obtain the same antifreeze protection requires 76 of propylene glycol to replace each 62 of ethylene glycol. Calculate the mass of propylene glycol required to replace 7.00 of ethylene glycol. Th
At equilibrium, the concentration of A is 0.381 M and that of B is 0.154 M. What is the value of the equilibrium constant, Keq?
An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.022 mol/L. What is the equilibrium concentration of BrCl?
If, in a certain experiment, over a specific time period, 0.0033 mol PH3 is consumed in a 1.5-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
A 309 mL sample of unknown HCl solution reacts completely with Na_2CO_3 to form 10.1 g CO_2. What was the concentration of the HCl solution?
In a certain experiement, 4.6 g Al is reacted with excess oxygen and 6.8 g of product is obtained according to this reaction: 4 Al = 3 O2 --> 2 Al2O3 What is the theoretical yield for this reacti
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons and nonbonding electrons. Show the formal charges of all atoms in the correct stru
How much heat is needed to melt 1050g of the unknown at 510k. the melting point of the solis unknown is 670k and the boilding point is 800k.
How many grams of Cu metal (63.55 g/mol) will be plated out of a Cu(NO3)2 solution by passing a current of 3.00 amperes for 11 minutes?
A researcher plans to compare two treatment conditions by measuring one sample in treatment 1 and a second sample in treatment 2. Briefly explain how the difference simply may be sampling error.
A 4.10 g nugget of pure gold absorbed 278 J of heat. What was the final temperature of the gold if the initial temperature was 25.0°C? The specific heat of gold is 0.129 J/(g·°C).
A perfect percent yield would be 100%. For each reaction, comment on your degree of accuracy and suggest possible sources of measurement error. How could these errors be reduced in the future?
A sample of nitrogen gas in a 4.7-L container at a temperature of 28°C exerts a pressure of 3.6 atm. Calculate the number of moles of gas in the sample.
when 50. grams of ethane gas is burned completely in oxygen. Carbon dioxide and water vapor are produce. How many mole of water vapor are produced?
Draw the molecular orbital diagram for O2. Assuming that the 2p molecular orbital is from the 2pz atomic orbitals and that the two 2p orbitals are from the 2px and 2py atomic orbitals.
Based on molecular structure, arrange the following sets of oxyacids in order of increasing acid strength.HClO3 ,HIO3 ,HBrO3. Explain.
What is the freezing point of a solution made by dissolving 352 g of ethylene glycol (C2H6O2) in 648 g of water? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/
a sample of hydrogen effuses through a porous container about 9.00 times faster than an unknown gas. estimate the molar mass of the unknown gas.
What is the total number of moles of aluminum oxide that can be formed when 54 grains of aluminum reacts completely with oxygen?
What is mass of O2 released? (0.2004g) How many moles of O2 were released? (.0063g) How many moles of KClO3 required by the moles of O2 released? (2 moles)
Cheap ethanol, C2H5OH, manufactured from crude oil, can be used in fake wine instead of of ethanol derived from fermentation of grapes. this fake wine.
What is the pH of a buffer prepared by adding 180 mL of 0.100 M NaOH to 200 mL of 0.100 M acetic acid? (Ka for CH3COOH = 1.8 x 10-5)
In a reaction 8200 g of sodium reacts with 74.00 g of ferric oxide to form sodium oxide and iron metal. Calculate the mass of sodium iron produced.
An “A” group metal (M) reacts with chlorine and oxygen to form ionic compounds with the formulas MCl4 and MO2. Propose a possible identity for the metal M. Explain your reasoning.
A 250.0 mL sample of chlorine gas is collected when the barometric pressure is 798 mmHg. What is the volume of the sample after the barometric pressure dropped to 745 mmHg?