An unknown substance has a mass of 19.1 g. when the substance absorbs 1.719*102 j of heat, the temperature of the substance is raised from 25.0 ∘c to 45.0 ∘c. what is the most likely identity of the substance?

Hydrocarbons consist mostly of carbon atoms bonded to helium atoms. true false

A shining metal M, on burning gives a dazzling white flame and changes to a white powder N. a) Identify Mand N. b) Represent the above reaction in the form of a balanced chemical equation.

What is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3?

How many grams of magnesium bromide, MgBr2, must be dissolved to prepare 400. mL of a 0.183 M aqueous solution of the salt?

List the specific sources of non renewable energy used in 2006

Based on the standard free energies of formation, which of the following reactions represent a feasible way to synthesize the product? A. 2C (s) + H2 (g) →C2H2 (g); ΔG∘f=209.2 kJ/molB. N2 (g) + 3H2 (g) →2NH3 (g); ΔG∘f=-33.30 kJ/molC.

How do I find the molar mass of Copper (II) Nitrate?

Describe several main ideas in chemistry

What is the wavelength of a wave having a frequency of 1.75*10^ 14 s^ - 1?

What alkene (s) would be produced from the dehydration of cyclopentanol?