Question

In: Chemistry

1. How many photons at 586 nm must be absorbed to melt 6.55 × 102 g...

1. How many photons at 586 nm must be absorbed to melt 6.55 × 102 g of ice?
(It takes 334 J to melt 1 g of ice at 0° C. On average, how many H2O molecules does one photon convert from ice to water?

2. The highest speed limit in the United States is 85.0 mph on an isolated stretch of rural interstate in Texas. What is the speed limit in kilometers per hour? (1 mi = 1609 m). Report your answer as a whole number.

3. A piece of metal with a mass of 22.1 g was dropped into a graduated cylinder containing 16.00 mL of water. The graduated cylinder after the addition of the metal is shown. Determine the density of the metal.

4. A lead sphere has a mass of 1.24 × 104g, and its volume is 1.10 ×103 cm3. Calculate its density.

5. Calculate the percent error for the following measurements: (a) The density of alcohol (ethanol) is found to be 0.8044 g/mL (true value = 0.7980 g/mL).  %(b) The mass of gold in an earring is analyzed to be 0.8455 g (true value = 0.8644 g).%

Solutions

Expert Solution


Related Solutions

Be sure to answer all parts. How many photons at 586 nm must be absorbed to...
Be sure to answer all parts. How many photons at 586 nm must be absorbed to melt 4.65 ×102 g of ice? (It takes 334 J to melt 1 g of ice at 0°C.) (Enter your answer in scientific notation.) On average, how many H2O molecules does one photon convert from ice to water? (Enter your answer in scientific notation.)
how many photons are produced in a laser pulse of 0.558 J at 431 nm?
how many photons are produced in a laser pulse of 0.558 J at 431 nm?
How many photons are produced in a laser pulse of 0.616 J at 529 nm?
How many photons are produced in a laser pulse of 0.616 J at 529 nm?
1. How many calories are required to melt 25 g of ice, heat the liquid from...
1. How many calories are required to melt 25 g of ice, heat the liquid from 0 C to 100 C and boil the liquid? 18,000 cal 29,500 cal 6,500 cal 26,000 cal 2. Scope mouthwash is a(n) homogeneous mixture compound element heterogeneous mixture 3. How many calories are needed to heat 25 g of water from 15 C to 27 C? 110 cal 0.48 cal 300 cal 2.1 cal
1.) How many grams of B are there in a sample of B that contains 6.55×1023...
1.) How many grams of B are there in a sample of B that contains 6.55×1023 atoms? 2.) A 19.35 gram sample of chromium is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of 33.49 g. Determine the empirical formula of the metal fluoride. (Enter the elements in the order Cr , F) 3.) A 25.34 gram sample of chromium is heated in the presence of excess iodine. A metal iodide is formed...
How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be...
How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 600. mL of 0.953-M solution of NH3 in order to prepare a pH = 9.65 buffer?
1. Describe how to perform a melt curve? In your test results, what did the melt...
1. Describe how to perform a melt curve? In your test results, what did the melt curve tell you about the PCR reaction? 2. What are the CQ values of each of our patient samples? 3. Which patient has the highest viral load? 4. Name 3 factors to consider when designing pairs of primers to be used for a PCR reaction.
Must show work H2(g)+ O2(g)→ 2H2 O(g) How many grams of water will be produced if...
Must show work H2(g)+ O2(g)→ 2H2 O(g) How many grams of water will be produced if there 5.0 gram of oxygen? How many moles of water will be produced if there are 2.0 moles of hydrogen? You conducted the above experiment in the lab and found that the 10.0 moles of water are produced, how many grams you actually produced of water? If you correctly done number 3, then it is your yield? If you started out the experiment with...
How much heat in kilojoules is evolved or absorbed in the reaction of 292.5 g of...
How much heat in kilojoules is evolved or absorbed in the reaction of 292.5 g of calcium oxide with enough carbon to produce calcium carbide? CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH∘ = 464.6kJ
How many grams of sucrose (C12H22O11) must be added to 477 g of water to give...
How many grams of sucrose (C12H22O11) must be added to 477 g of water to give a solution with a vapor pressure 0.555 mmHg less than that of pure water at 20 degrees celsius? (The vapor pressure of water at 20 degrees celsius is 17.5 mmHg).
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT