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When numbers are very small or very large, it is convenient to either express the value in scientific notation and/or by using a prefix with the unit.
A laser emits light at a wavelength of 591 nm. How many photons and moles of photons does it emit each second if its power is 6.0 W?
How much heat energy is needed to raise the temperature of a 50 g sample of aluminum from 32.7 ?C to 98.7 ?C? The speci?c heat of aluminum is 0.897 J/g · K. Answer in units of J
The mass of mercury needed to fill the tube is found to be 107.5g. Calculate the inner diameter of the tube in centimeters.
How much heat (in kJ) is required to warm 11.0g of ice, initially at -10.0°C, to steam at 112.0°C? The heat capacity of ice is 2.09 J/g⋅°C and that of steam is 2.01 J/g⋅°C.
A gaseous mixture of rm O_2 and rm N_2 contains 36.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 485 mmHg?
If the volume of ocean water (5.4 x 10^20) contains 2.4 percent sodium chloride ("salt") by mass and the density of the water is 1.61 g/mL, calculate the total mass of sodium chloride. (1 ton = 2000
At a temperature of 25oC and a pressure of 750 mmHg, 1.50 g of cyanogen occupies 0.714 L. what is the molecular formula of cyanogen.
A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0 .C,& ; the volume of the gas is 361 mL. To what& ; temperature must the gas be heated to occupy a volume of 492
A quantity of gas under a pressure of 1.78 atm has a volume of 550 cm square. The pressure is increased 2.50atm while the pressure remains constant what is the new volume?
If the density of the center of the sun is 1.40 g/cm3 at a pressure of 1.30 × 109 atm, calculate the temperature. Answer in units of .C
An empty gasoline can with dimensions 15 cm by 40 cm by 12.5 cm is attached to a vacuum pump and evacuated. if the atmospheric pressure is 14.7 lb/in^2, what is the total force in pounds on the out
What is the molar mass of a gas if 0.358 g of the gas occupies a volume of 186 mL at 5.00C and 1.10 atm?
For the reaction 2 HCl + Na2CO3 ! 2 NaCl + H2O + CO2 179.2& ; liters of CO2 is collected at STP. How many moles of NaCl are also formed?
Rather than weigh the sample on a balance, a chemist chooses to dispense the liquid using a graduated cylinder. What volume of the liquid should he use?
The analysis of a hydrocarbon revealed that it was 85.6281% C and 14.3719% H by mass. When 2.55 g of the gas was stored in a 2.5 L flask at 127.276C, it exerted a pressure of 454 Torr. What is the
If the reaction N2(g) + 3H2(g) ! 2NH3(g) is carried out at constant temperature and pressure, how much H2 is required to react with 6.4 L liters of N2?
To what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
Lipitor,a pharmaceutical drug that has been shown to lower "bad"cholesterol levels while raising "good" cholesteral levels inpatients taking the drug, had over $11 billion in sales in 2006.Assuming
An element has two isotopes with masses of 62.9396 u and 64.9278 u,and 30.83% of the atoms are the heavier isotope. Calculate the atomic mass of this element and give its name and symbol.
How much heat is required to raise the temperature of 0.362kg of copper from23.0C to 60.0 C. The specific heat is 0.920 (g. C).
The volume (in m3 at STP) and composition of the off-gases when air 20% (by volume) in excess of the theoretical requirement is used.
The concentration of C20H42 (FM 282.55) in winter rainwater is 0.2 ppb. Assuming that the density of rainwater is close to 1.00 g/mL, find the molar concentration of C20H42.
3 isotopes of argon occur in nature. Ar-36, Ar-38, and Ar-40. The abundance of each are as follow: 0.34%, 0.07%, and 99.59%, calculate the average atomic weight of argon.
The combustion of 45.0 g of methane (natural gas) releases 2498 kJ of heat energy. How much energy in kilocalories kcal would combustion of 0.670oz of methane release?