Chemistry Questions

What is the mass in grams of 1.73 moles CaH2
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An analysis of an oxide of nitrogen with a molecular weight of 92.02 amu gave 69.57% oxygen and 30.43% nitrogen. What are the empirical and molecular formulas for this nitrogen oxide? Complete and balance the equation for its formation from the elements nitrogen and oxygen.
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What are particles of carbon otherwise known as, and what kind of pollution do they cause???
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Which element has an atom in the ground state with a total of three valence electrons
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Determine the total mass of ethanol produced when 279. Grams of glucose rescts completely to form ethanol and 132 grams of carbon dioxide.
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What does Nb stand for on the periodic table? Pls help! Need aware soon
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The total number of sodium atoms in 46.0 grams of solution is?
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In which sample of water do the molecules have the highest average kinetic energy?(1) 20. mL at 100.°C (3) 60. mL at 60.°C(2) 40. mL at 80.°C (4) 80. mL at 40.°C
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Which compound has the lowest vapor pressure at 50°C?(1) ethanoic acid (3) propanone(2) ethanol (4) water
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What is the gram-formula mass of (NH4)3PO4?(1) 112g/mol (2) 121g/mol (3) 149g/mol (4) 242g/mol
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Which sample of HCl(aq) contains the greatest number of moles of solute particles?(1) 1.0 L of 2.0 M HCl(aq)(2) 2.0 L of 2.0 M HCl(aq)(3) 3.0 L of 0.50 M HCl(aq)(4) 4.0 L of 0.50 M HCl(aq)
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Which laboratory test result can be used to determine if KCl(s) is an electrolyte?(1) pH of KCl(aq)(2) pH of KCl(s)(3) electrical conductivity of KCl(aq)(4) electrical conductivity of KCl(s)
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A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of(1) 1.0 (3) 3.0(2) 0.20 (4) 20.
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What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass =26 grams/mole)?(1) 1.3 M (3) 3.0 M(2) 2.0 M (4) 0.75 M
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In an experiment, 2.54 grams of copper completely reacts with sulfur, producing 3.18 grams of copper(I) sulfide.Determine the total mass of sulfur consumed.Write the chemical formula of the compound produced.
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Which atom in the ground state requires the least amount of energy to remove its valence electron?(1) lithium atom (2) potassium atom (3) rubidium atom (4) sodium atom
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The solubility of KCl(s) in water depends on the(1) pressure on the solution(2) rate of stirring(3) size of the KCl sample(4) temperature of the water
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As carbon dioxide sublimes, its entropy(1) decreases (2) increases (3) remains the same
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