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How much energy is required to break a single Ne-21 nucleus into protons and neutrons if the nucleus has a mass of 20.98846 amu?
What mass of NaH2PO4 must be added to 1.20 L of 0.20 M Na2HPO4 to make a buffer solution whose pH=6.90? pKa2(H3PO4)=7.21.
If glass beads in the lab were replaced by a material with less surface area, will liquid seperation be better or worse
Which of the following reactions is the formation reaction for CH3OH(l)
For each reaction below, predict the conditions under which it is spontaneous. Circle the appropriate temperature condition: (a) H2O(g) H2O(liq) low temp high temp all temps
A 25.0-mL sample of potassium chloride solution was found to have a mass of 25.115g. When the solution was heated to dryness, the mass of the solute residue was 0.252g. Calculate the (a)mass/mass % concentration and (b) molar concentration.
The patient has a deficiency of argininosuccinate lyase and has very high concentrations of blood glutamine and ammonium ion.
why KF is a better reagent than LiF for the replacement of chlorine in organic compounds by the autoclave reaction
A 1.000 g sample of a compound containing C, H and O is burned in excess oxygen, producing 1.783 g CO2 and 0.734 g H2O. Determine the empirical formula of the compound.
Identifying An Unknown Liquid And Precipitate. A high-boiling bp = 202 - 204 degrees C, burns with a yellow, sooty flame. Sodium fusion indicates that halogens, nitrogen and sulfur are not present. It is not soluble in water, dilute sodium bicarbo..
Use the values of Ka1 = 0.056 and Ka2 = 5.4 x 10-5 to calculate the [OH-] in a 0.387 M solution of oxalic acid (H2C2O4). Use E notation and 3 significant figures.
he worked up the reaction and isolated 2.4 g of MnCl2. What was his percent yield?
Draw chemical structures to explain why a water molecule might be essential to producing a stable crystal of caffeine.
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