Combustion analysis of an unknown compound provides the following dаta: 73.5 grams C, 4.20 grams H, and 72.3 grams Cl. What is the percent composition of each element in this compound?

A reaction is spontaneous if delta G is 1) positive 2) negative 3) zero

How many moles of CaCl2 will be produced from 1.4 moles of HCl reacting with calcium hydroxide?

5. What is the temperature - 34°C expressed in kelvins? A. 207 K B. 339 K C. 239 D. 139 K

To which series would the emitted light belong if an electron in a hydrogen atom underwent a transition from level n = 5 to level n = 1?

What are the main postulates of Bohr's model?

A reaction mixture initially contains 22.02 g Fe2O3 and 14.66 g CO. Assume that the reaction will progress to 100% completion. What mass (in g) of the excess reactant is leftover?

A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer at its bottom. Which change of state is shown in the model?

Which ion was fomed by providing the second ionization to remove an electron A) ca2 + B) N3 - B) Fe3 + C) S2

A reaction was performed in which 3.7 g of benzoic acid was reacted with excess methanol to make 2.1 g of methyl benzoate. Calculate the theoretical yield and percent yield for this reaction.

According to Reference Table N, which radioactive isotope will retain only 1/8 its original radioactive atoms after approximately 43 days? A. gold-198 B. iodine-131 C. phosphorus-32 D. radon-222