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Two students weighed a 125-ml beaker that had a mass of 80.562g on a calibrated top-loading balance. Each student used their own top-loading balance, recorded three mass readings for the beaker, and then determined the average. Below are the results: Student A Student B 80,560 80,400 80,555 79,551 80,565 81,729 A) Find the Averages B) Which set of results matches the known mass of the beaker? C) Which set of results is more precise? D) Which student has the more reliable balance?
Given the following reaction: 2 O2 + CH4 CO2 + 2 H2O What mass of CH4 is required to completely react with 100 grams of oxygen.
Either bulb will be used for 2,000 hours per year at an electricity cost of $0.14/kwh (kilowatt-hour). If the interest rate is 6%, which bulb is more cost effective over 8,000 hours of use based upon a comparision of Net Present Values?
In a saturated solution of lead (II) fluoride the concentration of lead was measured to be .0021 M. What is the value of Ksp for PbF2?
a solid block of exactly 100.0 cm3 has a mass of 153.6g. Determine its density. will the block sink or float in water
One a cold day a person takes a breath of 450 ml of air at a pressure of 745 mm Hg and room temperature of 21oC. What is the volume of this air in the lungs at 37oC and 758 mm Hg?
How many liters of NO(g) can be made from 17.57 L of O2(g) and 16.55 L of N2(g) at STP?
A solution composed of 50% ethanol (EtOH), 10% methanol (MeOH), and 40% water (H2O) is fed at the rate of 100 kg/hr into a separator that produces one stream
What is the phosphoanhydride bond on the NADH structure? Although NADH and ATP both have phosphoanhydride bonds
If 15.78 mL of a Na2S2O3 solution were required to titrate the iodine formed from 20.95 mL of a 0.0111 M KIO3 solution and excess KI, what is the molarity of the Na2S2O3 solution?
Calculate the reaction Zn(s) + 2HCl(aq) ! ZnCl2(aq) + H2(g) What mass of ZnCl2 (MW = 136.3 g/mol) can be prepared from the reaction of 3.27 grams of zinc (MW = 65.38 g/mol) with 3.00 grams HCl (MW = 36.46)?
A mixture of gases contains 0.290 mol CH4, 0.240 mol C2H6, and 0.300 mol C3H8. The total pressure is 1.40 atm. Calculate the partial pressure of the gases.
How much heat is required to raise the temperature of a 7.40-g sample of iron (specific heat = 0.450) from 25C to 79.8C?
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