There are two gas compounds that are made out of element  A and B. This is the mass percentage of the two compounds. Compound 1: 30.43% A, 69.57% B Compound 2: 63.64% A, 36.36% B In a normal state element A and B exist as a gas. (It can be mono atomic molecule, diatomic molecule or triatomic molecule) When you react gas A and gas B and make a product these things come out. (All in same temperature and pressure) 1 Volume of Gas A + 2 Volume of Gas B = 2 Volume of Compound 1 2 Volume of Gas A + 1 Volume of Gas B = 2 Volume of Compound 2 Determine the relative mass of element A and B from the reaction formula above. Also you should assume the simplest chemical formula of reactant and products

What is the mass in grams of 1.75 x 10^24 atoms of silicon? grams How many silicon atoms are there in 32.4 grams of silicon? atoms

A 43.0 g sample of hydrated cobalt (II) sulfite is heated resulting in anhydrous cobalt (II) sulfite with a mass of 26.1 g. Write the formula of the hydrate.

Complete the table below for calculating the molecular mass of the compound water. Formula:  Atom Atomic mass   # Atoms   Mass in compound H  u/atom ×  atoms  =  u O  u/atom ×  atoms  =   u Molecular mass =  u

Match the term on the left box with the most appropriate definition on the right. 1 Empirical Formula A A compound with a specific number of water molecules bonded to each formula unit. 2 Mass Percent B This shows only the relative amounts of the elements, not the actual amounts. Atoms of an element are chemically similar but Chave different numbers of neutrons and, thus, different mass numbers. This represents an element in a compound is the D mass of the element expressed as a percentage of the total mass of the compound. E The study of mass-mole-number relationships in chemical reactions and formulas. F The reactant that runs out first following a chemical reaction. G The amount of substance contains as many elementary entities as exactly 12g of carbon-12. The law states that the elements in a chemical H compound are always present in the same proportions by mass. A compound that does not have any water I molecules bonded to it; applies to compounds that can be hydrated. J This…

A metal (M) forms a compound with the formula MI2. The compound contains 79.97% I by mass. Identify the metal in the compound? Give the symbol of the metal.

White sand is made of silica (silicon dioxide, or SiO2), which has a density of 2.20 g/cm3. How many silicon atoms are in a spherical grain of sand 0.385 mm in diameter?

Copper wire is sold in spools according to the gauge number of the wire. The gauge number refers to the diameter of the wire. Determine the number of meters that are present in a 10 lb spool of 12-gauge copper wire. (Copper has a density of 8.96 g/cm3. A 12-gauge wire has a diameter of 0.0808 in.) How many copper atoms are present in this length of wire?

Graphite, one form of carbon, is a powdery black solid used to make pencil lead.  A speck of graphite powder just visible to the unaided eye has a mass of about 1x10-6 g.  How many carbon atoms are there in such a speck of graphite?

Assume that for the following molecules, carbon=12 amu, hydrogen= 1 amu, nitrogen= 14 amu and oxygen= 16 amu. Please calculate the molecular mass of molecular oxygen.