An 8.10-g sample of hydrated magnesium carbonate is heated. It has a mass of 4.94 g after heating. What is the percentage by mass of water in the hydrate?

3.16%

17.6%

39.0%

61.0%

If ammonia is manufactured at 356 k, is the reaction spontaneous, given that the enthalpy and entropy change for the reaction are - 93 kj/mol and - 198 j/mol k, respectively?

What is the ph of a solution of 0.450 m kh2po4, potassium dihydrogen phosphate?

Jamal lives in a place where it is hot in the summer and cold in winter. His family decided to improve the insulation in their house. Infer what happened to the cost of heating and cooling their house. Explain why?

Which is the best definition of a solution? A. A solution is two gases mixed together. B. A solution is a mixture that has the same composition throughout. C. A solution is any two liquids mixed. D. A solution is the same as a mixture.

Chemical formula for urea?

What is the mass (in grams) of 9.09x10^24 molecules of methanol (CH3OH) ? AND How many moles of N are in 0.183g of N2O?

What are the basic building blocks of matter? A) molecules B) atoms C) electrons D) compounds

How does an atom with too few neutrons relative to protons undergo radioactive decay? * by converting proton to a neutron by converting a neutron to a proton by emitting an alpha particle

What is the chemical formula for the compound formed between sodium and iodine?

8. Write a balanced chemical equation showing how you could prepare each of the following salts from an acid-base reaction: KNO3, NaBr, and Cas.