Calcium:
~Atomic weight: 40.078
~Atomic #: 20
~Density: 1.55
~Alkali Earth Metal
97% of the naturally occurring Calcium is isotope Ca-40, so massnumber 40. Other isotopes have massnumber 42 to 48
By definition, one mole would be the same as the atomic mass. You take the number of moles and multiply it by the atomic mass. So if you have just 1 mole, the number of grams will be the atomic mass. Calcium's atomic mass is 40.08 grams.
Ca stands for Calcium, 20 is the atomic number, and 40 is the average atomic mass
Atomic number is the number of protons in the nucleus of an atom. The mass number however is the sum of the protons and neutrons in the nucleus of an atom. Each element has one specific atomic number (= no. of protons), but can have more different number of neutrons, hence it might have different mass numbers, those atoms are called 'isotopes' of an element. Examples are given below Calcium: Ca(40) has 20 protons and 20 neutrons (mass no. 40) Ca(41) has 20 protons and 21 neutrons (mass no. 41) Kalium: K(40) has 19 protons and 21 neutrons (mass no. 40) K(41) has 19 protons and 22 neutrons (mass no. 41)
The mass of 3,400 mol Ca(OH)2 is 251,9 g.
The atomic symbol for an isotope of calcium will be the regular symbol for calcium, Ca. The number of protons will differ from standard calcium. This is written below the mass number Ca.
For this you need the atomic mass of Ca. Take the number of moles and multiply it by the atomic mass. Divide by one mole for units to cancel. Ca= 40.1 grams.761 moles Ca × (40.1 grams) = 30.5 grams Ca
97% of the naturally occurring Calcium is isotope Ca-40, so massnumber 40. Other isotopes have massnumber 42 to 48
Ca represents calcium. Calcium-40 represents the isotope of calcium that has a mass number of 40.
For Ca isotope 40 it is 20 neutrons and 20 protons, but there are 5 other naturally occurring (>2%) Ca-isotopes with mass numbers ranging from 42 - 48. Remember: p + n = mass number, so n = m - p
For this you need the atomic mass of Ca. Take the number of grams and divide it by the atomic mass. Multiply by one mole for units to cancel.40.0 grams Ca / (40.08 grams) = .998 moles Ca
Ca - calcium
By definition, one mole would be the same as the atomic mass. You take the number of moles and multiply it by the atomic mass. So if you have just 1 mole, the number of grams will be the atomic mass. Calcium's atomic mass is 40.08 grams.
First of all, we should know what a mole and molar mass of an element means. Then answering this question would be easy. Mole is a number( like pi, 1, 2, etc.). It is approximately 6.0225 *1023 . 1 mole of anything is same as the number of atoms in 12 grams of Carbon C12 sample. The mass of mole of an element/compound is called it's molar mass expressed in grams. The molar mass of a monoatomic element is equal to it's mass number. So, we know Ca's mass number = 40. that means 1 mole of Ca weighs 40 grams. =>1/40 mole of Ca weighs 1 gram. =>(1/40)*23 moles of Ca weighs 23.0 gram. =>0.575 moles of Ca weighs 23.0 gram. So there are 0.575 moles of Ca atoms in 23.0g of Ca
Ca stands for Calcium, 20 is the atomic number, and 40 is the average atomic mass
Multiply number of x adn ave mass per x
Atomic number is the number of protons in the nucleus of an atom. The mass number however is the sum of the protons and neutrons in the nucleus of an atom. Each element has one specific atomic number (= no. of protons), but can have more different number of neutrons, hence it might have different mass numbers, those atoms are called 'isotopes' of an element. Examples are given below Calcium: Ca(40) has 20 protons and 20 neutrons (mass no. 40) Ca(41) has 20 protons and 21 neutrons (mass no. 41) Kalium: K(40) has 19 protons and 21 neutrons (mass no. 40) K(41) has 19 protons and 22 neutrons (mass no. 41)