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Calculate the percent compostion of impure benzoic acid. The orignial weight of benzoic mixture was 4.23 g. The final weight was 3.11 g after extraction.
Which of the following has the smallest mass? a. 3.50 x 1023 molecules of I2
A compound is 40.0% C , 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. The molecular formula mass of this compound is 240 amu. What are the subscripts in the actual molecular formula?
what is the concentration of a nitric acid solution if a 10.00ml sample of the acid reqires 31.25ml of 0.135m koh for neutralization.
Mixture also contains He (helium gas). determine the partial pressure of the He gas?
Aluminum reacts with oxygen to make aluminum oxide. If 5.2 moles of aluminum react, how many moles of aluminum oxide are formed. Show work.
for the reaction Mg+2HCl yeilds H2+MgCl2, calculate the percentage yield of magnesium chloride if 100.g of magnesium react with excess hydrochloric acid to yield 330.g of magnesium cholride.
A growth factor for cells was identified from extracts of rat brain. Preliminary characterization was done on this activity using several methods.
A 52.2 g block of an unknown metal at 85.5oC was dropped into an insulated vessel containing approximately 37 g of ice and 27 g of water at 0oC. After the system had reached equilibrium
A 782 mL gas sample at STP is compressed to a volume of 131 mL, and the temperature is increased to 22 ? C. What is the new pressure of the gas in Pa? Answer in units of Pa
What mass of silver was in the original solution? (Assume that all of the silver was precipitated out of solution by the reaction.)
Complete and balance the equation for this reaction in basic solution. Phases are optional.
Calculate the energy produced when 15 grams of liquid methanol (CH3OH) is completely burnt in air to produce carbon dioxide gas
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