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At a distance of 42 ft , an ionizing radiation source delivers 7.0 rem of radiation. How close could you get to the source and still have no biological effects?
the solubility product constant for MgF2 is 6.4 × 10-9. How many grams of MgF2 will dissolve in 150 mL of H2O at 25°C?
At constant pressure, in which of the reactions is work done by the system on the surroundings? By the surroundings on the system? In which of them is no work done?
Calculate the mole fraction of water in this solution, assuming that the KI is completely dissociated. b) Predict the vapor pressure of water over this solution at 25 °C, assuming complete dissociation of the KI.
a scientist wants to make a solution of tribasic sodium phosphate na3po4 for a laboratory experiment. how many grams of
write the balanced net ionic equation for the reaction that produces the solid. Include phases and charges. c) calculate the percent sodium chloride in the original unknown mixture.
Calculate the partial pressure of ozone and the number of ozone molecules per liter of air if the tempreture and pressure were 20.0 degrees C and 758 mmHg, respectively.
Pretend that an electron performs 1D motion in the field of the proton so that it's wavefunction is psi(x)=cos(x/a), where a=0.5 Angstrom.
How do you write chemical formulas for: cobalt (II) hydorgen carbonate and sulfur hexafluoride
a certain first-order reactio has a rate constant of 3.60times10-3 at 45 . how many minutes does it take for the
A 12.0g sample of granite initially at 83.0°C is immersed into 26.0g of water initially at 21.0°C. What is the final temperature of both substances when they reach thermal equilibrium?
The temperature dependence of the reaction rate constant is given by the equation: ... ln k = ln A - Ea/RT ... ... Where: k = rate constant T = temperature A
a brick has a mass of 4.0kg and the earth has a mass of 6.01027g.be sure your answers have the correct number of
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