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The condensed/abbreviated electron configuration of selenium (Se) atom is the following:

A compound has the following mass percent composition: 25.7% carbon 2.20% hydrogen 71.1% oxygen The molar mass of the compound is 90 g/mol. What is its molecular formula? Molar masses: C 12.01 H 1.01 O 16.00 Type your answer. _______

The total number of electrons in an atom of carbon is

The number of moles contained in 12.6 g of salt: NaCl is _______ g. Type ONLY correctly rounded number (without unit) and do NOT use scientific notation.. Molar masses: Na 22.99 Cl 35.45 _______

How many molecules are contained in 2.35 g of carbon dioxide? Molar masses: C 12.01 O 16.00

Butane is a flammable gas with the chemical formula: C4H10{“version”:”1.1″,”math”:”C4H10″}Type the empirical formula of butane. Use uppercase letters for chemical symbols. _______

1 mole of zinc and 1 mole of iron have the same masses. 

Which of the following atoms have its valence electrons located in 5s and 5p orbitals?

The full/complete electron configuration of arsenic is the following

According to the following equation, calculate the theoretical yield, in moles, of water if 2.43 moles of ammonia reacted with oxygen used in excess. 4 NH3 + 5 O2 →4 NO +6 H2O{“version”:”1.1″,”math”:”4 NH3 + 5 O2 →4 NO +6 H2O”}