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Ruth takes her body temperature using a digital thermometer. The thermometer reads
35.6 .C. However, her actual body temperature is 36.5 C. What is the relative error in
the temperature reading?
A 1 kg bag of detergent has an absolute error of 0.003 kg. What is the measured value
of the bag of detergent?
What is the mass in grams of oxygen gas, O2 is needed to complete the combustion of 6 L of methane, CH4? Assume that the pressure and temperature remain constant. (be sure to write the balanced chemical equation)
Calculate the cell potential of the galvanic cell at 298К consists of two silver electrodes immersed into two solutions having с1(Ag+)= 10 –2mol/L and с2(Ag+)= 10 –1mol/L.
An Organic compound contains 68 % carbon & 8% hydrogen and rest is nitrogen. Determine empirical formula of the compound ?
Calculate the pH of a solution prepared by dissolving 2.20 got sodium acetate, CH3COONa, in 78.0 mL of 0.25 M acetic acid, CH3COOH(aq). Assume the volume change upon dissolving the sodium acetate is negligible. Ka of CH3COOH is 1.75 x 10^-5
Ammonia will react with fluorine to produce dinitrogen tetrafluoride and hydrogen fluoride (used in production of aluminum, in uranium processing, and in frosting of light bulbs).
2NH3(g) + 5F2(g) → N2F4(g) + 6HF(g)
How many moles of NH3 are needed to react completely with 13.6 mol of F2?
A gas with the following composition is burned with 50% excess air in a furnace. What is the composition of the flue gas by percent?
CH4: 60%; C2H6:20%; CO: 5%; O2: 5%; N2: 10%
If 4.50 moles of NaHCO3 reacted with 2.40 moles of HCl,
Take note of the chemical equation: NaHCO3 + HCl → NaCl + H2O + CO2(g)
MnO2 + HCl = MnCl2 + Cl2 + H2O
If 1.92 mol of MnO2 and 96.4g of HCl react, determine the limiting reagent. Also determine the mass of Cl2 and the mass of unused reactant after the reaction.
