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-- Matter is neither created nor destroyed in a chemical reaction. Thus, the mass of the products of a chemical reaction must be equal to the mass of the starting materials. Formally, this concept is called the law of conservation of mass.
-- A sample of sodium reacts completely with 0.213 of chlorine, forming 351 of sodium chloride. What mass of sodium reacted?
-- When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 24.0 of carbon were burned in the presence of 75.4 of oxygen, 11.4 of oxygen remained unreacted. What mass of carbon dioxide was produced?
A student is required to generate 90.0 mL of carbon dioxide at 750 mm Hg and 21C using potassium hydrogen carbonate and HCl. What is the mass of the potassium hydrogen carbonate needed?
carbonyl stretching frequency of aliphatic carboxylic acids in dilute solution is located near 1770cm. this frequency
a sample of pure no2 is heated to 388c at which temperature it partially dissociates according to the
Suppose a buffer solution is made from formic and, HCHO2, and sodium formate, NaCHO2. What is the net ionic equation for the reaction that occurs when a small amount of sodium hydroxide is added to the buffer
A small cube of lithium (density = 0.535 g cm-3) measuring 1.00 mm on each edge is added to 0.500 L of water. The following reaction occurs- 2 Li(s) + 2 H2O(l) ? 2 LiOH(aq) + H2(g)
Given Mo Energy level diagram for diatomic molecules, which of the following molecular ions has a bond order of 3. Why
A reaction has a rate constant of 1.27×10?4 /s at 28 degrees C and 0.226 /s at 78 degrees C. Determine Activation Barrier. What is the value of the rate constant at 16 degrees C?
Which of the following is true of the individual resonance structures which contribute to a resonance hybrid? a) each resonance structure actually exists b) each resonance structure is more stable than is the resonance hybrid c) in going from one ..
Calculate the enthalpy change for the neutralization reaction. Calculate the experimental error compared to the accepted your value in question 2.
The concentrationof the alkane C20H42 (FM= 282.55) in a particular sample in rain water is 0.2ppb. assume that the density of the rain water is close to 1.00 g/ml and find the molar concentration of C20H42.
How many hours are required for 0.100 mol of electrons to flow through a circuit if the current is 1.00 A
Write electron configurations for each of the following elements. Use the symbol of the previous noble gas in brackets to represent the core electrons
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