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A certain carbon-hydrogen compound contains 84.1% C by mass and the remainder is hydrogen. What is the empirical formula of the compound?
A. C3H6B. C3H4C. C4H9D. C4H10
What is the pressure of the gas in this mercury manometer if h = 73 mm and atmospheric pressure
How many neutrons are there in an atom of lead whose mass number is 208? A) 82 C) 208 E) none of them B) 126 D) 290 8. Atoms of the same element with different mass numbers are called A) ions. C) allotropes. E) isotopes. B) neutrons. D) chemical f..
Covert the EU Nitrate standard of 50ppm to its nitrogen content alone. Is the EU standard more or less stringent than the United States regulatory limit
Draw the lewis dot structure oxalate and for carbon dioxide. In terms of electronic structure, what happens when oxalate decomposes
When a rod of metallic lead was added to a 0.0100M solution of Co^+3, it was found that 68% of the cobalt in solution was reduced to Co^+2 by the lead. Find the value of K for Pb + 2Co^+3 = Pb^+2 + 2Co^+2
Determine the half- life, in hours of iodine-123 If the amount of radioactive Iodine-123 in a sample decreases from 0.4 grams to 0.1 grams in 26.4 hours?
If a solution is made by adding 83 grams of sodium hyroxide to 750 ml of water what is the percent by mass of sodium hydroxide in this solutions ?
The half-life of C-14 is 5730 years. A bone sample with 3.6 g of carbon has 32.6 disintegrations per minute. How old is the bone sample in years?
How many grams of iron metal do you expect to be produced when 265 grams of an 84.5 percent by mass iron (II) nitrate solution reacts with excess aluminum metal?
determine the freezing point depression, delta Tf, for the ionic solution. b. determine m effective for ionic solution. c. determine the van't Hoff factor, i, for the ionic compound.
How much heat is required to warm 223 g of ice from -46.3°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
Which of the following buffer systems would be the best choice to create a buffer with the pH= 9.00? For the best system , calculate the ratio of the masses of the buffer components required to make the buffer.
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