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Q- In mexico avocados are 48 pesos per kilogram. What is the cost, in cents, of an avocado that weighs 0.45 lb if the exchange rate is 13 pesos to the dollar?
Q- A graduated cylinder contains 155 mL of water . A 15.0-g piece of iron (density = 7.86g/cm^3) and a 20.0-g piece of lead (density = 11.3 g/cm^3) are added. What is the new water level, in milliliters, in the cylinder? motion commented
Q- Ethyl alcohol has a density of 0.79 g/ml. What is the volume, in quarts, of 1.50 kg of alcohol?
Glass will dissolve in concentrated solutions of either NaOH or KOH. At 25C the two reactions below tae place at the same rate. 4NaOH + SiOH2 -->Na4SiO4 + 2H2O is reaction 1. reaction 2 is 4KOH + SiO2 ---> K4SiO4 + 2H2O
The vapor pressure of chloroform (CHCl3, molar mass 119.5 g/mol) is 4.00 x 10^2 torr at 42.7 C. if 40.0 g of CHCl3 is enclosed in a 10.0 L container, how much liquid CHCl3, if any, will remain in the container
A mixture of 82.0 g of magnesium (24.31 g/mol) and 350 g of iron(III) chloride (162.2 g/mol) is allowed to react. What mass of magnesium chloride (95.21 g/mol) can be formed?
If 2.50 g CuSO4 are dissolved in 8.0 x 10^2 mL of 0.25 M NH3, what are the concentrations of Cu2+, Cu(NH3)4^2+, and NH3 at equilibrium
A 20 mg sample of a compound is dissolved in 5.0 ml of water and extracted with 2.5 mL of heptane. After separation of the layers, the heptane layer is found to contain 15 mg of the compound. What is the partition coefficient of the compound, Khep..
The decomposition of HI(g) is represented by the equation 2HI(g) H2(g) + I2(g) Kc= 64 at 25°C. If the equilibrium concentrations of H2 and I2 at 400°C are found to be [H2] = 5.0x10-4 M and [I2] = 1.4x10-3 M, what is the equilibrium concentration o..
Use the Gibbs phase rule to find the degrees of freedom for the following systems at equilibrium: a. Liquid water in equilibrium with water vapor. b. Liquid water in equilibrium with humid air.
If adding 0.552g sample of Metal X to 150 ml of 1.0M HCL caused a temperature increase of 7.33 degrees C, calculate the quantity of heat that has flowed.
the density of aluminum is 2.7 g/cm cubed, if the volume of this object is 12ml, what is the mass of the grams?
The solution filtered , then we took 25 mL of this unknown acid for titration. we use NaOH base for titration ,the volum of titrated base when it reach the equivalence point was 3.2 mL . and the concentration of NaOH is 0.1 M.
A fossil is found to have a 14C level of 75.0% compared to living organisms. How old is the fossil
indicate whether aqueous solutions of each of the following solutes will contain only ions, only molecules, or mostly molecules and a few ions: a) NH4Cl, a strong electrolyte. b)ethanol, CH3-CH2-OH, a nonelectrolyte. c)HCN, hydrocyanic acid, a wea..
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