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How is it possible that hard water can also be very saline ie The River Murray in South Australia? If sodium is added to soften hard water, then wouldn't the presence of salt in hard water 'soften' the water naturally?
How much heat is required to raise the temperature of 73.5 of water from its melting point to its boiling point?
What is the maximum number of grams of NaCl that can be added to 4.0 L of a 0.0090 M lead(II) chloride solution (without changing the volume significantly)
A 4.000-g sample of the metal nitrate M(NO3)2 was dissolved in water and treated with excess aqueous sodium sulfate. The sulfate salt that formed weighed 3.318 g. Determine the identity of the metal.
A compounds 'H NMR spectrum shows resonance at 9.28 and 7.50 ppm what possible structural subunit does the compound contain
Which one of the following pairs of acids and conjugate bases is incorrectly labeled or incorrectly matched?
Solid sodium peroxide (Na2O2) reacts with liquid water yielding aqueous sodium hydroxide and oxygen gas. How much heat is released
Calculate (a) the work done when the gas expands isothermally against a constant external pressure of 200 Torr until its volume has increased by 3.6 dm3, and (b) the work that would be done if the same expansion had occurred reversibly.
Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more com- plicated, but this is a reasonable ?rst ap proximation.)
Determine the mass of acetamide present per kg of water if the freezing point of this solution is 0 °C. (The freezing point of pure water is 0°C (exactly) at 1 atm pressure and the molal freezing-point-depression constant for water is 1.86°C/m.)
A gas is heated from 268 K to 290 K while its volume is increased from 25.0 L to 37.0 L by moving a large piston within a cylinder. If the original pressure was 0.90 atm, what would be the final pressure?
Explain why the rates of diffusion of nitrogen gas and carbon monoxide are almost identical at the same temperature.
When two atoms of 2H (deuterium) are fused to form one atom of 4He (helium), the total energy evolved is 3.83 × 10-12 joules. What is the total change in mass
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