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A helium nucleus has two protons and two neutrons. How many electrons would it take to equal the mass of a helium nucles
NaOH + CO2 -→ Na2CO3 + H2O . If the average human body discharges 536 g of CO2 per day, how much NaOH is needed each day for each person in the spacecraft?
How much heat energy, in kilojoules, is required to convert 47.0 g of ice at -18.0 degrees C to water at 25.0 degrees C ?
calculate the equilibrium partial pressures of CO2 and CO.
How much heat energy is required to raise the temperature of 0.368 of copper from 23.0 to 60.0 ? The specific heat of copper is 0.0920 .
An unknown carbohydrate compound has the empirical formula CH2O. A solution consisting of 0.515 g of the carbohydrate dissolved in 1.717 g of acetic acid freezes at 8.8°C
a gas mixture with a total pressure of 770 mmHg contains each of the following gases at the indicated partial pressures: CO2, 122 mmHg; Ar, 209 mmHg; and O2, 191 mmHg. The mixture also contains helium gas. what is the partial pressure of the heliu..
To what volume should you dilute 130. mL of an 7.11 M CuCl2 solution so that 65.0 mL of the diluted solution contains 4.24 g CuCl2?
A 370. mL air sample collected at 35°C has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 49°C.
By Solving this problem student understand about isotopic abundance and how to calculate atomic weight (average atomic mass) of an element -
a titration curve for H3PO4 (triprotic acid) and a mixture of three weak acids?
What [OH-] is necessary to start precipitation of Cu(OH)2 in a 0.0014 M copper(II) chloride solution?
a lake in central texas contains 5.0 billiion liters of water. the pH is normally 6.4, but it is tested at 5.6. how much CaCO3 should be added to bring the pH to a more reasonable 6.0?
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