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Energy is either absorbed or released for all chemical reactions, and we call this energy the enthalpy of reaction (?Hrxn). If the enthalpy of reaction is positive, then we say that the energy was absorbed or that the reaction was endothermic. If the enthalpy of reaction is negative, then we say that energy was released or that the reaction was exothermic. Most chemical reactions are exothermic. In this problem, you will measure the amount of heat released when solid MgO is reacted with aqueous HCl to form water and then you will calculate the heat of reaction. MgO(s) + 2HCl(aq) = H2O(l) + MgCl2(aq) A weigh paper will be on the balance with approximately 2.81 g MgO on the paper. The calorimeter will be on the lab bench and filled with 100 mL 1.000 M HCl. Data Table: Mass MgO 2.8045g initial temperature(°C) 24.99°C final temperature(°C) 25.00 °C Is the observed reaction endothermic or exothermic? What will be the sign of ?Hrxn?
4HCl + MnO2 = MnCl2 + 2H2O + Cl2 When 1.22 mol of HCl reacts with excess MnO2, how many moles of Cl2 form?
when companies sell compressed gas in steel cylinders, they usually quote the contents as volume of gas at 1 atm pressure at tempertaure of 20 degrees celcius.
what is the flow of the gulf stream in milliters per minute (b) what mass of water in the gulf stream flows past a given point in 24 hours? the density of seawater is 1.025 g/ml
A 325-mL sample of solution contains 25.3 g of CaCl2 calculate the molar concentration of Cl in this solution
Tripeptide Protein: Acidic, Basic, or Neutral? Alanine has an R-group structure of CH3, cysteine has an R-group structure of HS-CH2, and aspartic acid has an R-group structure of HOOC-CH2
If 17.2 mL of 0.800 M hydrochloric acid solution are required to neutralize 5.00 mL of a household NH3 solution, determine the molar concentration of the NH3,ammonia?
How many moles of CO2 will be produced in the combustion reaction starting with the 15.02 grams of ethane.
explain why granulated activated charcoal is considered to be the best available treatment technology for dioxins in water.
An individual suffering from a high cholesterol level in her blood has 241 mg of cholesterol per 100 { mL} of blood. If the total blood volume of the individual is 5.1 L, how many grams of total blood cholesterol does the individual's body contain..
Draw the enantiomer of cis-1-chloro-3-methylcyclopentane which is R at C-1. 1) What is the configuration of this molecule at C-3 (R and S)?
When you heat baking soda (NaHCO3), it breaks down into sodium carbonate powder (Na2CO3), carbon dioxide and water vapor. Write a correct thermo chemical equation and explain what it tells you about the reaction ( The enthalpy of this reaction is ..
Magnesium hydroxide is used in several antacid formulations. When it is added to water it dissociates into magnesium and hydroxide ions. Mg(OH)2(s) Mg2+(aq) + 2OH-(aq).
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