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
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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.
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