Chemistry

Chemistry, 01.07.2019 20:30, chaanah

What is true about 1.0 mol ca and 1.0 mol mg they are equal in mass they contain the same number of atoms they have the same atomic mass their molar masses are equal

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Chemistry, 09.07.2019 06:40, maggiegoodenough62

Amole is equal to 6.02 x 10²³, just like a dozen is equal to 12. so if you have a mole of carbon atoms, you have 6.02 x 10²³ carbon atoms. likewise, if you have a dozen carbon atoms, you have 12 carbon atoms. the atomic mass on the periodic table is also known as the molar mass. the molar mass is the mass of 1 mole of the element. therefore, 1 mole of carbon has a mass 12.01g/mole. how many atoms are in 5.2 grams of carbon? show your work. (this is a unit conversion problem.)

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Chemistry, 11.07.2019 09:00, faithtunison

N1913, henry moseley discovered a way to calculate the atomic number for each element and it was determined to arrange the periodic table by atomic number and not atomic mass. why is atomic number the better way to organize the elements of the periodic table and not organizing by atomic mass? a: the atomic number and atomic mass are equivalent, so the atomic number is used because it is a smaller number. b: the atomic number can be different for atoms of the same element, so it makes the patterns of the periodic table more varied. c: the atomic number can vary based on the number of neutrons the atoms of the same element have, so the atomic mass may not be in order. also, the atomic mass is unique to each element. d: the atomic mass can vary based on the number of neutrons the atoms of the same element have, so the atomic mass may not be in order. also, the atomic number is unique to each element.

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Chemistry, 12.07.2019 04:30, cruzhazeL999

98 points hurry in 1913, henry moseley discovered a way to calculate the atomic number for each element and it was determined to arrange the periodic table by atomic number and not atomic mass. why is atomic number the better way to organize the elements of the periodic table and not organizing by atomic mass? question 12 options: the atomic number can vary based on the number of neutrons the atoms of the same element have, so the atomic mass may not be in order. also, the atomic mass is unique to each element. the atomic number and atomic mass are equivalent, so the atomic number is used because it is a smaller number. the atomic mass can vary based on the number of neutrons the atoms of the same element have, so the atomic mass may not be in order. also, the atomic number is unique to each element. the atomic number can be different for atoms of the same element, so it makes the patterns of the periodic table more varied.

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Physics, 02.11.2019 22:31, cbreazzy

In 1961 the mlar atomic mass of carbon 12 was defined to be exactly 12g/mol (a value agreed upon by chemists and physicists) and the molar atomic masses of all the elements were re-evaluated according to this new standard. this made the re-evaluated molar mass of oxygen-16 become 15.994915g/mol. avogadro's number is defined as the number of atoms in the molar atomic mass of an element. the present accpted value for avogadros' number is 6.0221367x10^23/mol. what was the value o avogadro's number used by physicists before 1961? .

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