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Explain A silver block, initially at 56.2 C, is submerged into 100.0 g of water at 24.4C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 27.4 C. Define What is the mass of the Silver Block?
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The Earth receives radiation from the Sun at the top of the atmosphere with a spectrum that resembles a blackbody emitter at a temperature of nearly 6000 K, although the temperature inside the Sun is about 15 million K. ...
What is the molarity, to the hundredths place, of 5.0 g HPO3 in 300. mL of solution?
A sample of a substance (containing only C, H, and N) is burned in oxygen. 8.696 g of CO 2 , 2.225 g of H 2 O and 4.446 g of NO are the sole products of combustion. What is the empirical formula of the compou ...
A student finds that the mass of an object is 6.62 kg. She is told that her measurement has an error of 12.3%. What is the true mass (in kg) of the object?
A 42.60 gram sample of a hydrate of BaI 2 was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, 39.01 grams of the dehydrated compound remained. What is the formula of th ...
Cesium-137 has a half-life of 30.17 years. The first atomic explosion at Trinity Site in New Mexico in 1945 generated significant amounts of cesium-137. It has been 73 years since this detonation. What fraction of the ce ...
Suppose 100.0 mL of an aqueous solution containing an unknown monoprotic acid (called HA) is titrated with 0.150 M KOH. The titration requires 47.82 mL of the potassium hydroxide to reach the equivalence point. What is t ...
At rest, a person inhales 9.72*10^21 nitrogen molecules in an average breath of air. How many mole of nitrogen atoms are inhaled? (Hint: in air, nitrogen occurs as a diatomic molecule)
2 H2S(g) + 3 O2(g) → 2 H2O(g) + 2 SO2(g) Using standard enthalpies of formation, calculate the standard enthalpy change for this reaction.
Carbon-carbon single bonds in organic molecules have energies about350. kJ/mol. What is the corresponding wavelength? Could UV lamps(248 nm) be used to break these bonds?
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