What is the enthalpy of combustion, per mole, of butane?

When a sample of a compound in the vitamin D family was burned in a combustion analysis, 5.983 mg of the compound gave 18.490 mg of CO2 and 6.232 mg of H2O. This compound was found to have a molecular mass of 399.

How many atoms of each element and how many atoms total 3MgO

Phenolphthalein is pink in an aqueous solution having a ph of (1) 5 (2) 2 (3) 7 (4) 12

Given the reaction: n2 (g) + 3h2 (g) 2nh3 (g) what is the mole-to-mole ratio between nitrogen gas and hydrogen gas? (1) 1:2 (3) 2:2 (2) 1:3 (4) 2:3

Which of the following is a compound? A. Sn B. Mg C. H D. CO

Why do magnesium and oxygen combine?

When a chemical reaction takes place, the number of atoms of each element in the reactants

A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen, and nitrogen. Which term most likely describes what she is measuring?

How would you expect energy to change during a chemical reaction? A. Energy will be increased. B. Energy will be decreased. C. Energy will be converted into another form. D. Energy will be consumed.

In the formula for the compound xcl4 the x could represent