A 0.025-g sample of a compound composed of boron and hydrogen, with a molecular mass of ~28 amu, burns spontaneously when exposed to air, producing 0.063 g of B2O3. What are the empirical and molecular formulas ofthe compound?

Glucose, C6H1206, can be represented by the molecular model shown below. If 1.00 mol of glucoseis submitted to combustion analysis, how many moles of CO2 and how many moles of H2O wouldbe formed?

How many moles of Al are necessary to form 52.2 g of AlBr₃ from this reaction: 2 Al(s) + 3 Br₂(l) → 2 AlBr₃(s) ?

Morphine (C₁₇H₁₉NO₃) is a painkiller in the opiate family. A sample of morphine was discovered that had been diluted by mixing with table salt (sodium chloride). When 2.00 g of the mixture undergoes combustion, 3.97 g of CO₂ is produced. What is the mass percent of morphine in the mixture?

The first step in the reaction of Alka–Seltzer with stomach acid consists of one mole of sodium bicarbonate (NaHCO3) reacting with one mole of hydrochloric acid (HCl) to produce one mole of carbonic acid (H2CO3), and one mole of sodium chloride (NaCl). Using this chemical stoichiometry, determine the number of moles of carbonic acid that can be produced from 33 mol NaHCO3 and 77 mol HCl.HCl. moles of carbonic acid :  ____________________mol   Which of the two reactants limits the number of moles of H2 CO3 that can be made? 1. HCl 2. NaHCO3   How much excess reactant remains after the reaction? excess reactant : ___________________mol

When a particular metal X reacts with HCl, the resulting products are XCl2 and H2, Write and balance the equation. When 78.5 g of the metal react completely, 2.42 g of hydrogen gas result. Identify the element X.

A 0.732 g mixture of methane, CH4, and ethane, C2H6, is burned, yielding 2.063 g of CO2. What is the percentage by mass of CH4 in the mixture?