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Some calcium supplements contain calcium citrate, Ca3(C6H5O7)2, and others contain calcium carbonate, CaCO3. Which compound has the higher mass percent of calcium?
If you have 44.6 g of carbon tetrachloride, how many atoms of chlorine do you have? How many grams of sulfur hexafluoride would you need to have 5.25 x 1024 fluorine atoms?
Write at least three of them. How many moles of Al atoms are needed to combine with 0.565 mol of O atoms to make aluminum oxide, Al2O3?
How to balance the chemical equation of aluminum and hydrochloric acid?
Calculate the molar mass for each of the following: calcium sulfide, CaS. For element X, 59.8 g corresponds to 2.6 moles. What is the atomic mass of the element?
A mini license plate for a toy car must consist of three numbers followed by a letter. Each number must be a 3,6, or 9. Each letter must be a T or R. Repition of digits is Not permitted. Use the co
Calculate the number of particles in each of the following: 0.125 mole zinc atoms, Zn 0.125mole zn/ 1 mole x 65.39 zn = 8.17375 or 81.74 g zinc.
How many years are there in 1 mole of seconds? Use conversion factors, and show which units cancel. 6.022 x 10^23 sec x 1 min/60 sec/ 1 hr/60 min/1 day/24 hr/1 yr/365 days = 6.022 x 10 ^23 sec 1.004
What is the probability that an event will occur between z = -0.46 and z = 2.21 on the standard normalized curve?
A bicycle tire is filled to a pressure of 4.42 atm (65 psi) at a temperature of 120C. If the temperature of the tire increases to 330C, what is the pressure in the tire? Assume the volume of the tire
Calculate the change in enthalpy when 52.0 g of solid chromium at 25 degrees celcius and 1 atm pressure is oxidized. (delta h for Cr2O3(s) is -1135 kJ/mol.)
A extraction plant uses an applied emf of 3.0v and a current of 310000 A. One tonne of Aluminium is extracted after 16 hours. What is the power consumption of the electrolysis?
A rock climber of mass 55 kg is hanging suspended from a rope tied to another climber ofmass 65 kg on a horizontal cliff ledge. If the coefficient of kinetic friction between the climber on the led
At an altitude of 300 m the field has magnitude 60.0 N/C; at an altitude of 200 m, the magnitude is 100 N/C. Find the net amount of charge contained in a cube 100 m on edge, with horizontal faces at
A plane sinusoidal electromagnetic wave in air has a wavelength of 3.84 cm and an E-field amplitude of 1.35 V/m. What is the B-field amplitude?
A room contains 3.9 x 10^4 grams of argon. If air has a density of 1.7 g/L and is 0.255% argon by mass, what is the size of the room?
Provide food to those who are currently starving. Educate the surviving populace about how to develop a sustainable agricultural system.
An electromagnetic wave with frequency 65.0 Hz travels in an insulating magnetic material that bas dielectric constant 3.64 and relative permeability 5.18 at this frequency. The electric field bas
A solution is made by dissolving 25.5 grams of glucose (C6H12O6) in 398 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show a
Is he or she being sensitive to the patient's concerns, beliefs, etc.? Do you have any suggestions for the clinician to help him/her work more effectively with this patient?
A generator rotates at 85.Hz in a magnetic field of 0.030 T. It has 1000 turns and produces an rms voltage of 150 V and rms current of 70.0 A. (a) What is the peak current produced?
What should the output voltage of the transformer at the generating plant be for an overall transmission efficiency of 98.5% assuming a perfect transformer?
Two positive point charges, q1= +16x10-6 C and q2 = +4 x10-6 C, are separated by a distance 3 m. Calculate the distance d between the charges where the net electric field is zero.
Question: Pure oxygen was first made by heating mercury (II) oxide: 2HgO --> 2HgO2. How many grams of mercury and how many grams of oxygen are formed from 45.5 g of HgO?
What is the basic principle of heat transfer applied to obtain the calorimeter heat capacity and heat of neutralization?