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Calculate the percent by mass of the solute in each of the following aqueous solutions.
The mass of an evacuated 255ml flask is 143.187g. The mass of the flask filled with 267torr of an unknown gas at 25*C is 143.289g. Calculate the molar mass of the unknown gas.
The hydrocarbon contains 93.75% carbon and 6.25% HYDROGEN. Calculate its empirical formula.
A stock solution is prepared by adding 15 mL of 2.5 M Ba(CN)2 to enough water to make 20 mL. What is the CN- concentration of 5 mL of the stock solution?
Question: A saturated aqueous solution of calcium hydroxide is approximately 0.13% calcium hydroxide, by mass, and has a density of 1.02 g ml^-1. What is the pH of such a solution?
Question: Consider the following reaction: CH3-Cl + I- ? CH3-I + Cl- Suppose we start the reaction with an initial concentration of CH3-I of 0.260M. Over a period of 1 hr 20 min, the concentration i
Calculate the cost of the refecting pool including sales tax which is 6%Finally calculate the total cost of the refelcting pool and the surronding rose garden.
What is the equation for the inverse of y = cosx +3?
Two fire towers are 30 km apart, towerA being due west of tower B. A fire is spottedfrom the towers, and the bearings from A and Bare E 14 degrees N and W 34 degrees N, respectively. Find the distan
The magnitudes and directions of two forces acting at a pointP are given in (a) and (b). approximate the magnitued and direction of the resultant vector.
The thread makes an angle of 5.29° with the horizontal on both sides of the spider. What is the tension in the thread?
You notice that you can barely see your cell phone, which went missing a few minutes before, on the bottom of the pool. How far from the side of the pool is your cell phone?
A pair of narrow parallel slits separated by a distance of 0.294 mm. What is the angle from the central maximum to the first bright fringe on either side of the central maximum?
A cowboy at a ranch fills a water trough that is 1.1 m long, 68 cm wide, and 44 cm deep. How long does it take the cowboy to fill the trough?
Write the equation of a rational function with intercepts(-2,0) (3,0),(0,0), vertical asymtotes x = 1, and no horizontal asymptote and oblique asymptote y = x2 - 5
Two circular hoops, with masses and radii in the ratios m2/m1=4 and R2/R1=4, rotate with angular speeds in the ratio ?2/?1=2. What is the ratio of the kinetic energies K2/K1?
A 120 kg scaffold is 6.6 meters long. It is hanging with two wires, one from each end. A 540 kg box sits 1 meter from the left end. What is the tension in the right hand side wire?
A converging lens (f = 13.0 cm) is held 7.10 cm in front of a newspaper, the print size of which has a height of 1.80 mm. Find the image distance (in cm) and the height (in mm) of the magnified
A refracting telescope has an angular magnification of -92.00. The length of the barrel is 1.100 m. What are the focal lengths of a) the objective and b) the eyepiece?
When the object is moved to 48.0 cm from the lens, the image moves 16.0 cm farther from the lens. Find the focal length of this lens?
A nature photographer wishes to photograph a 25 m -tall tree from a distance of 63 m. What focal-length lens should be used if the image is to fill the 36 mm height of the film?
An airplane is flying at an elevation of 5150 ft,directly above a straight highway. Two motorists are driving cars onthe highway on opposite sides of the plane, & the angle of depression to one
It is pulled by a tugboat toward shore and into a river, heading toward a dry dock for repair. As the boat is pulled up the river, it sinks. Why?
The manager's special advertise the same tires selling at a rate of $380 for 4 tires. How much do you save per tire if you purchase the manager's special.
If the DNA coding sequence -CAA-CCG-GAT- were miscopied during replication and became -CGA-CCG-GAT-, what effect would there he on the sequence of the protein produced?