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How many grams of O2 are contained in a 25.0 L sample at 5.20 atm and 28.0°C? 2. How many moles of gas are present in a 10.0 liter sample at STP? 3. How many grams are in 10.0 mEq of Ca2+?
14 g of Si reacts with 16 g of O to produce SiO2, the only product, with no reactant left over. How much SiO2 would be produced from 34 g of Si and excess O?
For a particle in a one-dimentional box, calculate the probability that the particle will be found in the middle third of the box: L/3 less than or equal to x less than or equal to 2L/3.
Antacid tablets contain a variety of bases such as NaHCO3, MgCO3, CaCO3 and Mg(OH)2, Only NaHCO3 has appreciable solubility in water. write a net ionic equation for the reaction of each antacid with aqueous HCl. include the state of each species. ..
If the 4.00g sample corresponds to 0.0666 moles of a compound, what is the molecular formula of the unknown molecule (CxHyOz)
Calculate the value of the equilibrium constant at 298 K for the reaction: Sn(s) + Sn4+(aq) 2 Sn2+(aq).
calculate the pH of a solution contaning 0.2m acetic acid (pka=4.7) and 0.1 m sodium acetate? a. write the equation ph=pka+log [A-]/[HA]
The pH of a bicarbonate-carbonic acid buffer is 8.30. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).
A solution is prepared by dissolving 43.7 g cesium chloride in 60.0 g water. The volume of the solution is 63.3 mL.
Assuming this particle is a single crystal, how many unit cells are lined up across the diameter of the particle? d. Calculate the mass of the particle. e. Approximately how many atoms does this particle contain?
A container of water is heated from 23.5C to 85.0C. This process requires 21,900 Joules of heat. Calculate the mass of the water. (c=4.184 J/g-C)
Draw the Lewis structures of the following compounds and find out number of electron groups, number of lone-pairs, geometry of electron
A sample of gas is confined to a cylinder housed with a movable piston. The gas occupies a volume of 1.8 L at 1.8 atm and 25°C. Calculate the volume of the gas sample if the pressure is increased to 8.6 atm at constant temperature.
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