93. 286 grams of N2 gas are placed into a canister with a volume of 7.5 L at 150oC. Calculate the pressure exerted by the gas inside the canister. a) 17 atm b) 47 atm c) 31 atm d) 1.3 atm e) 0.042 atm 94. Calculate the mass of NaN3 needed for an air bag to produce 100.0 L of N2 gas at 85.0oC and 1.00 atm, using the following balanced chemical equation. 2 NaN3 (s) → 2 Na (s)...
A wooden pallet is stacked with 10 bags of flour. Each bag of flour has a mass of 100 kg. How much work is accomplished in sliding the pallet over a wooden floor a distance of 50 cm? If the estimate the friction coefficients between the pallet and the wooden floor is 0.4.
130 grams boiling water (100 celcius), heat capacity 4.2 J/gram/K, poured into a pan 1000 grams mass, heat capacity .9J/gram/K. Tfinal tempis 59.59c. The temp is raised to 81.3c and 28916 Joules of work have been done on the water. How much energy transfer due to temperature difference was there from the stove into the system of the pan and water?
In the figure, a cord runs around two massless, frictionless
pulleys. A canister with mass m = 42 kg hangs from one pulley, and
you exert a force F on the free end of the cord. (a) What must be
the magnitude of F if you are to lift the canister at a constant
speed? (b) To lift the canister by 4.0 cm, how far must you pull
the free end of the cord? During that lift, what is the...
Three forces act on a cargo canister that was initially stationary but that now moves across a frictionless floor. The force magnitudes are F_1 = 2.80 N. along the -x - axis: F_2 = 3.80 N, at theta_2 = 52.0; and F_3 = 100 N, at theta_3 = -122.0; What is the net work done on the canister by the three forces during the first 2.00 m of displacement? 16 J 4 J -16 J 3 J A child whose...
Prof. D went grocery shopping and purchased one dozen eggs and one pound of flour (all of the other ingredients are in excess). - Which ingredient (eggs or flour) is in excess and how much is in excess or left over? 1. Use L.R. and calc. the amt of E.R. used in the reaction. 2. Use theoretical yield and calc the amt. of the E.R. used in the rxn. (2 c. flour + 2 eggs → 9 pancakes) Magnesium oxide...
2, Sarah uses 5ķups of flour for every 2 loaves of bread she bakes. What is the unit rate of cups of flour per loaf of bread? Using this unit rate, how many cups of flour will Sarah need to make 5 loaves of 3. Rosie bought some tickets to a concert and found out that she could not go. She decided to sell them on line. Rosie wanted to markup the price 7% to make some money. If she...
Assume instructions for conducting a reaction tell you to start with a certain amount of reactant A, and then add two equivalents of reactant B. How will the amounts of reactants A and B be related? The mass of B will be twice the mass of A The mass of A will be twice the mass of B The volume of B will be twice the volume of A The number of moles of B will be twice the number...
6. 2.50 grams of nicotine (C10H14N2) was dissolved in 150.0 g of dichloromethane. What is the concentration of that solution in molality? b. In mole fraction? 7. How many grams of sucrose (C12H220.1) do you need to make 500.0 mL of a 0.050M solution? 8. Some intravenous sugаr solutions are 5.0% glucose (C.H1206) by mass. How many grams of glucose are in a 1.0L IV bag if the density of the solution is 1.01 g/mL.
1) A sample of Fe-59 has a mass of 200 grams. If the half-life of Fe-59 is 45 days, how many days will it take until only 10 grams of the original sample remains? Give your answer to the nearest day. 2) Some years ago Ms. Lopez invested $5000 at 12% compounded monthly, and the account now contains $20000. How many years ago did she start the account? Give your answer to the nearest year.