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If air's density is 1.29 g/l define what three gaseous elements if place in a balloon would cause the balloon to rise in air as well as what three elements would cause the balloon to sink in air?
A 0.066 mol sample of formaldehyde vapor, CH2O, was placed in a heated 500. mL vessel and some of it decomposed. The reaction is CH2O(g) H2(g) + CO(g). At equilibrium, the CH2O concentration was 0.040 mol L-1. Calculate the value of Kc for this rea..
Identities of the components in a mixture may be determined by a technique called spiking. Suppose you had run a gas chromatogram on your product and had then deliberately added a drop of a known sample of 3-methylcyclohexene to a drop of your pro..
We assume the first step in this decay series is, by far, the slowest and that all the 206Pb found in the sample is derived from this decay process. How old (in billions of years, where 1 billion = 109) is the rock
Calculate in how many years these signs will have to be replaced. Assume that the end lifetime is when the emission from the tritium is down to only 37% from the initial emission when installed
A mixture moistened with water and placed it in a desiccator (drying chamber) with silica gel to dry at 22C. the silica gel absorbed water vapor as the mixture dried.
In formation of the Grignard reagent Mg is converted to magnesium with a plus two oxidation state. Circle the reaction type magnesium is undergoing.
Stearic acid has a freezing point of 71.20 C and a Kf of 4.890C/m. A 400.0 g quantity of stearic acid to which 50.0 g of an unknown is added has a freezing point of 68.00C. Calculate the molar mass of the unknown.
A compound is 40.0% C , 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. The molecular formula mass of this compound is 240 amu. What are the subscripts in the actual molecular formula?
What is the equivalent weight of (MnO4). How many equivalents of electrons were delivered to the unknown soln
acetylene is hydrogenated to form ethane c2h6. the feed to thereactor contains 1.5 mol h2mol c2h2.a. calculate the
8.5 g of steam at 373 k is added to 305 g of h20 l at 310 k at constant pressure of 1 bar. is the final state of the
What is the pH of a buffer that is 0.50 M NH3 (pKb = 4.75) and 0.20 M NH4Cl after 50 mL of 0.2 M HCl is added to the 1 L solution
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