Determining the empirical formula
Determine the empirical formula of a 4.58g sample that contains 2 g of phosphorus with the balance of the mass being oxygen
Expected delivery within 24 Hours
The Hope diamond weighs 44.0 carats. Determine the volume occupied by the diamond, given that its density is 3.5 g/cm3 at 20°C, and that 1 carat = 0.200 g.
Determine how many 1.5 L balloons at 755 mm Hg can be inflated with the gas in the tank, assuming that the tank will also have to contain He at 755 mm Hg.The temperature 25 C in all the cases.
Calculate the expected change in temperature for 4.5 g of NH4NO3 dissolved in 100.0 mL of H2O. Assume that the calorimeter absorbs no heat.
If a 10.0 g sample of Zn(s) is treated with excess HCl, what volume of hydrogen gas is evolved at STP?
A solution of 0.90 g of an unknown nonelectrolyte in 300 mL ofwater at 27?C has an osmotic pressure of 38.4 torr. What is the molecular weight of this compound? (Neglect volumechange due to solute, R = 0.0821 L·atm/mol·K)
Determine the number of representative particles in each substance:
A student reported the follow ing percentages for his unknown mixture: 25%NH4Cl, 30% NaCl, and 50% SiO2. Assuming that the calculations were done correctly, explain the students error?
What is the molarity of a solution of 14.0 g NH4Br in enough H2O to make 150 mL of solution?
A weak acid (HA) is found to ionize 17.8% when mixed at a concentration of 0.3 mol/L. What is the value of Ka for this acid?
What is the pressure of 170. mL of oxygen gas at 76.0°C and 170. mm Hg if the conditions are adjusted to 450. mL and 127°C? Assume the amount of gas is held constant.
Start Excelling in your courses, Ask a tutor for help and get answers for your problems !!
Discuss the importance of format, location, and frequency in determining the optimal data visualization method. Is one more important than the other?
Problem: What term describes the system of rules that establish moral values and guide behavior?
What is the main idea of the theory that game engines act as "cultural software"?
Given Hofstede's dimensions, in what way do the cultures of Burger king (America) and Tim Hortons (Canada) significantly differ?
Discuss a brand that adapts its positioning by targeting different customer segments in different countries.
What public purposes are served by strong land use regulation? Could those purposes be fulfilled by any other means?
Problem: Which internal OR external (pick one) communications were most essential?