The molar mass of sucrose (c12h22o11) is 342.3 g/mol. a chemist has a 0.500-mol sample of sucrose. what is the mass, in grams, of this sample? 171 342 500 684

The mass of a chemical compound can be calculated for if its molecular mass and its moles is known. The product of the moles and the molecular mass will the give the mass in gram of that substance.
The appropriate formula for this work is : Mass of sucrose in 0.5mol = Moles * molecular weight
 0.5 * 342.3 = 171.15
Thus, the mass in grams of the sample is 171.

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If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom