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A chemistry student prepares lead(II) iodide from 1.35 g of lead (II) nitrate and excess aqueous potassium iodide. If the student collected 1.72 g of PbI2 and the theoretical yield is 1.88 g, what is the percent yield? A 1.95 g sample of potassium bicarbonate is decomposed by heating. If the resulting potassium carbonate weighs 1.54 g and the calculated yield is 1.35 g, what is the percent yield? can anyone help me with either of these I'm very lost D:
What is the minimum mass of oxygen, in grams, needed to burn 39.7 g C6H6O? Give your answer to three significant figures
A compound is known to contain 51.27% carbon and 27.30% oxygen by mass. Each molecule contains two atoms of oxygen. What is the molar mass of this substance
1. what is the molality of a solution that contains 3.0g urea molecular weight 60 amu in 100g of benzene?2. calculate
Quicklime (CaO) is produced by thermal decomposition of calcium carbonate(CaCO3). Calculate the volume of CO2 at STP produced form the decomposition of 146 g CaCO3 by the reaction: CaCO3(s) -> CaO(s) + CO2(g)
a 112.2510g irregularly shaped object is placed in a graduated cylinder that contains 25.0 cm cubed of water. What is the solids density if the new water level was 37.5 cm cubed
A mixture of CaCO3 and CaO weighing 0.630 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.500 g.
Draw the product of the reaction between 1-butyne and NaNH2 in NH3, then D3O+. To add a deuterium atom, first explicitly add an H.
Sodium chlorate,NaClO3, decomposes when heated to yield sodium chloride and oxygen, a reaction used to provide oxygen for the emergency breathing masks in many airliners
Where would we predict benzene to absorb if we treated the pi-electrons as particles on a ring (radius 1.39 A)? What is the % error? I'll give you a hint.
How much heat does your body lose when 3.35g of sweat evaporates from your skin at 25 degrees celsius? (Assume that the sweat is only water.) The heat of vaporization of water at 25 degrees celsius is 44.0 kJ/mol.
Rank the following slightly insoluble compounds from the most soluble to the least soluble. CaCO3 Ksp = 2.8 x 10-9 Co(OH)2 Ksp = 1.6 x 10-15 CaF2 Ksp = 3.9 x 10-11 BaSO4 Ksp = 1.1 x 10-10
One way of solving systems of linear equations is by adding a multiple of one equation to the other. The multiplier for one equation is chosen so that one of the two variables will cancel out in the sum
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