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Question- A student found that 0.300g of magnesium combined with oxygen to form 0.497g of magnesium oxide. What is the mass percentage composition of Mg, and O in magnesium oxide?
Express your answer to two significant figures and include the appropriate units.
What volume (L) of H2 at 745 torr and 20.oC can be prepared from 4.8 g of water? (Atomic weights: Fe = 55.85, O = 16.00, H = 1.008; 1 atm = 760 torr).
Which of the following equations represents the proper net ionic equation for the complete neutralization reaction between the weak acid HClO2 (aq) and the strong base NaOH (aq)
an electrochemical cell is created using gold and magnesium half-cells.a. determine which half-cell will undergo
Menthol, the organic substance in the pills can smell menthol cough drops, consisting of carbon, hydrogen and oxygen. A sample of 100.1 mg menthol burns in oxygen, yielding 282.9 mg of carbon dioxide and water 115.9mg.
Determine the temperature (in degrees Celsius) above which the reaction is non-spontaneous under standard conditions.
draw the structures of methyl salicylate and say what evidence indicates that methyl salicylate was formed. draw the
how many grams of methane must be combusted to heat 1.20g of water from 23.0c to 93.0c assuming as a product and 100
it absorbs 32.60 kj of heat from its surroundings. what is its final temperature in C (specific heat .9930 J g C for Al)
For each of the following cases, identify the order with respect to the reactant, A. Case (A ----> product) 1. The half-life of A increases as the initial concentration of A decreases
an unknown hydrocarbon a with formula c6h12 reacts with 1 molar equivalent ofh2 over palladiumcatalyst. hydrocarbon a
What is Nitroglycerin's molar mass if the addition of 0.454 g of nitroglycerin to 100.0 g of benzene changes the solution's vapor pressure to 94.85 mm Hg?
A biochemist studying the break down of insecticide DDT finds that it decomposes by a first-order reaction w/ a half-life of 12 years. How long does it take DDT in the soil sample to decompose from 2.40 x10^2ppbm to 10. ppbm (parts per billion by ..
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