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Suppose that the atomic mass unit (amu) had been defined as one-twelfth of the average mass of an atom of nitrogen instead of one-twelfth of the mass of an atom of carbon-12. What would the average atomic mass of potassium be on this new scale?
1. Average atomic mass of potassium on new scale = ?
What would the value of Avogadro's number be on this new scale?
2. New value for Avogadro's number = ?
To what volume must 558 mL of 13 M Ca(OH)2 solution be diluted to make a 3 M Ca(OH)2 solution?
2,3-dimethyl-2,3-butanediol upon heating in aqueous acid, rearranges to form 3,3-dimethyl-2-butanone. Suggest a mechanism for this
Nitrogen monoxide is produced by combustion in an automobile engine. According to the following reaction, how many moles of oxygen gas are necessary to form 0.285 moles nitrogen dioxide
Bones vary in mechanical properties. Where on the range of mechanical properties for bone do you think this bone would fall? Address at least elastic modulus, yield stress, and yield or ultimate strain.
Calculate the osmolarity of this solution. my answer is 0.499 osm. Is that correct? 2*(.1249) + 1 (.2499)
How much heat is required to raise the temperature of 42.5 g of water from its melting point to its boiling point?Express your answer numerically in kilojoules.
An analysis showed that 25.0 g of this hydrate, CoCl 2 * 6 H 2 O, contains 11.3 g of water. What is the percent water by weight in this hydrate?
Carry out the correct operation on the following set of values. Give answers in correct units and in the correct number of significant digits.
Draw a Lewis structure for each of the following molecules and determine its molecular geometry. What kind of intermolecular forces are present in each substance?
Consider the following reaction. N2 + 3 H2 → 2 NH3 . 28.0 grams of N2 and 5.04 grams of H2 are reacted, producing 17.8 grams of NH3. What is the percent yield?
An experiment shows that a 250 mL gas sample has a mass of 0.430 g at a pressure of 728 mmHg and a temperature of 26 C. What is the molar mass of the gas?
What mass of solid sodium fluoride (molar mass = 41.99 g/mol) should be added to 1.0 L of 0.23M hydrofluoric acid to make a buffer with a pH of 2.94? (Ka of HF = 1.36 x 10-3)
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