Estimate the number of traffic deaths averted.

I was told to first calculate the number of deaths/mile, calculatethe number of miles, then calculate the number of deaths adverted. But I'm not sure how to continue after figuring out the number of deaths/mile. The death toll in the 1989 Loma Prieta earthquake in California's Sant Cruz Mountains was approximately 100. Traf ...continues

Calculate the number of grams of citric acid, C6H8O7, needed to make 2500mL of 0.4 M C6H8O7

1. Calculate the number of grams of citric acid, C6H8O7, needed to make 2500mL of 0.4 M C6H8O7. 2. How many grams of sodium hydroxide, NaOH, would you have to dissolve in 250 mL of water to make a 0.5 M solution of NaOH? 3. How many liters of water are required to make a 0.2M solution sulfide, Na2S, using 200g of Na2S?

When some large nuclear plants run at full capacity, they produce about 1900 MW of electrical power.

When some large nuclear plants run at full capacity, they produce about 1900 MW of electrical power. At this rate, what mass of 235U (kg) would it consume per year if the efficiency of converting nuclear energy to electricity is 33%? How many metric tons of coal would be required to supply the same amount of electricity?

Rate of reactions

1. The numerical value of the rate constant for the gaseous reaction 2N2O5 reacts to form 4No2 + O2 was found to be 5.80 times 10 exp -4. The initial concentation of N2O5 was 1.00 mol/L. Assuming all measurements are recorded in seconds, determine the time required for the reaction to be 60% complete. 2. Rea ...continues

Thermodynamics

1. 5.30 moles of gas, initially at 25 degrees celcius and 5.00 atm pressure, was allowed to expand adiabatically( with no heat exchange between systen and surroundings) against a constant external pressure of 1.50 atm until the initial volume had trebled. The heat capacity of the gas was known to be 37.1 J/ degree celuius mol ...continues

Electrochemistry

1. Calculate the standard stat emf, fancy E, change in G, and K at 25 degrees celcus for the following reaction 2Na(s) + 2H20(l) --------- 2NaOH(aq) + H2(g) standard reduction potentals: Na(positive 1) + e- ---------Na -2.71V 2H20 + 2e- ------------H2 + 2OH- - .83V 2. What mass of Pb would ...continues

Rates and electrochemistry

The numerical value of the rate constant for the gaseous reaction 2N2O5------- 4NO2+ O2 was found to be 5.8*10-4. The initial concetration of N205 was 1.00mol/L. Assuming all measurements are recorded in seconds, determine the tim required for the reation to be 60% complete if the reaction is second order ...continues

Rates and electrochemistry

1. Step 1: Cl2 ------ 2Cl (fast) Step 2: CHCl3 + Cl -------- CCl3 + HCl (slow) Step 3: CCl3 + Cl ------------CCl4 (fast) Identify the rate determining step, reaction intermediates and the experimental rate law (intermediates can not be in the rate law) 2. For the half-reaction XeF2(aq) + ...continues

Thermodynamics

1. At 25 degees C, (triange)H(little o) for the combustion of liquid octane, C8H18(l) to form CO2(g) and H2O(l) is -5471kJ/mol. Calculate (triangle)E(little o) for this reaction at 25 degrees C. 2. The molar heat of vaporization of benzene, C6H6, at 1 atm is 30.8 kJ/mol. the boiling point of benzene at 1 atm is 78.3 degre ...continues

Relationship between refractive index and mole fraction

How can you use refractive indices to calculate weight % composition of a distillate and its residue? How can you convert the weight % composition to mole fractions? Could you please show me how they relate in mathematical form?