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A superconductor is a substance that is able to conduct electricity without resistance, a property that is very desirable in the construction of large electromagnets. Metals have this property if cooled to temperatures a few degrees above absolute zero, but this requires the use of expensive liquid helium (boiling point 4 K). Scientists have discovered materials that become superconductors at higher temperatures, but they are ceramics. Their brittle nature has so far prevented them from being made into long wires. A recently discovered compound of magnesium and boron, which consists of 52.9% Mg and 47.1% B, shows special promise as a high-temperature superconductor because it is inexpensive to make and can be fabricated into wire relatively easily. What is the formula of the compound?
50 mL of 0.1200 M hydroxyacetic acid (pKa = 3.83) are titrated with 0.1280 M KOH. What is the pH after the addition of 48.6 mL of the base
The amount of nitrogen in an organic substance can be determined by an analytical method called the Kjeldahl method, in which all the nitrogen in the organic substance is converted to ammonia.
Bulb B has 0.4 mole of ideal gas B at a pressure of 3 atm and is at 100 C. Calculate the final pressure of gas A when the two bulbs are open to each other.
what happens when acetate ion reacts with mercuric chcloride? explain with reactions?
A mass of 0.750 g calcium chloride is diluted with 975 g H2O. What is the chloride ion concentration (in ppm)?
A buffer that contains 1.10 M base, B, and 0.700 M of its conjugate acid, BH+, has a pH of 9.250. What is the pH after 0.0050 mol of HCl
A 30.0 mL sample of a diprotic acid is titrated with .250 M KOH. If 70.0 mL of the base is needed to reach the equivalence point, explain what is the molarity of the acid
When 2.0 x 10^2 mole of nicotinic acid (a monoprotic acid is dissolved in 350 mL of water, the pH is 3.05. What is the Ka of nicotinic acid
1. determine the volume of 6.4410-2 m adenosine triphosphate atp that is having 1.68 mol of adenosine triphosphate
undergo an isothermal compression until the pressure of the system is four times the original pressure. The process may occur in two ways:
Florine is so reactive that it forms compound with material insert to other treatment when 0.448gm of plantinum is heated in florine, 0.71gm of dark red, volatile solid forms. What is emperical formula
An archeologist finds a huge monolith in the desert. In order to estimate the weight of this object; he estimates the dimensions of the monolith and removes some chips from the rock with his hammer.
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