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When 45.0 g of an unknown nonvolatile nonelectrolyte is dissolved in 500.0 g of water, the resulting solution freezes at -0.930 °C. What is the molar mass of the unknown substance? Kf = 1.86 °C/m for water.
Question- Rubidium has a crystal structure based on the body-centered cubic unit cell. 1) What is the mass of one unit cell of rubidium
Chlorine reacts with water to produce hydrochloric acid. Suppose 2.5 kg of chlorine were added to an olympic-sized swimming pool. How many grams of calcium carbonate would be needed to neutralize
Copper has a specific heat of 0.092 cal/(g·°C). When 52.7 cal of heat is added to a piece of copper, the temperature increases from 22.4°C to 38.6°C. What is the mass of the piece of copper
Remembering the general equation for the combustion of a hydrocarbon, does the difference in these two trends disprove any connection between human activities and global warming? Explain your reasoning.
WHy is the exo product preferentially formed over the endo product in the acid catalyzed hydration of norbornene to form norborneol
Explain what is the enthalpy change for the formation of PbO(s) from lead metal and oxygen gas
A sample of magnesium wieghs 26.1 mg. How many moles of magnesium are there in the sample? Calculate the mass of one mole of the ionic compound that forms from strontium an dbromine.
What mass of ethanol, CH3CH2OH, should be dissolved in 450. g of water to obtain a freezing point of 4.5°C?
calculate how many protons are required to pass through the xeno-FoF1-ATP synthase complex to synthesize one ATP.
A sample of oxygen , at 24 c occupy a vol of 4.14*10(2) milliliters(ml)at 1.53 atm pressure. What pressure must be applied to compress. the gas to a volume of 1.377*10(2) ml , with no temperature change
If 0.500 L of aqueous solution with a density of 1.05 g/ml contains 18.3 ug (micrograms) of poison, express the concentration in ppm and ppb.
1. the absorbance of an iron thiocyanate solution containing0.00500 mg feml was reported as 0.4900 at 540 nm.a
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