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Find the percentage by mass of Cl in MgCl2 if it is 25.5% Mg by mass. Find the percentage by mass of sodium (Na) in Na2S if it is 41.1% sulfur (S) by mass. Determine the percentage by mass of each element in (a) salt, NaCl, and (b) sugar, C12H22O11.
A collapsed balloon is filled with He to a volume of 11.2L at a pressure of 1.00 atm. Oxygen (O2) is then assed so that the final volume of the ballon is 21
Evaluate reversibility of a process where an ideal monoatomic gas is first slowly compressed 10-fold by a gradually increasing external pressure (gas remains in thermal equilibrium with the surroundings)
Multiple choice questions in nuclear chemistry - which equation represents the balanced nuclear equation
A 25.5g aluminum block is warmed to 65.3 degC and plunged into an insulated beaker containing 55.0g water initially at 22.3 degreeC. The aluminum and the water are allowed to come to thermal equilibrium.
Suppose you are given a 2.75 g sample of the orginal mixture. You isolated the pure metal from the other components and determined that the mass of the metal was 1.25 g. What is the percent by weight of the metal in the orginal sample
Calomel (Hg2Cl2) is not toxic however methyl mercury chloride (CH3HgCl) is highly toxic. Explain what physical property explains this difference in toxicity. Mercury and Mercury Poisoning
Use the appropriate standard reduction potentials to calculate the value of k at 25 degrees celcius
A constant current 104.0 A is passed through an electrolytic cell having an impure copper anode, a pure copper cathode, and an aqueous electrolyte. How many kilograms of copper are refined by transfer from the anode to the cathode in a 15.5hour pe..
The freezing point of camphor is lowered by 26.4°C while 2.663 g of the compound is dissolved in 14.00 g of camphor (Kf = 40.0 K kg/mol.) Explain what is the molecular formula of the unidentified compound
how many grams of sodium oxide will be formed if 46 grams of sodium are used in the reaction. 4Na + O2 yields 2Na2O
Problem- A 0.093 M solution of a weak monoprotic acid is 2.2% ionized at 25 degrees C. What is the acid-ionization constant, Ka, for this acid
The first step in the citric acid cycle of food metabolism is reaction of oxaloacetate with acetyl CoA to give citrate. Propose a mechanism, using acid or base catalysis as needed.
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