Add your answer and earn points. How many moles of calcium (Ca) atoms are in $77.4 \mathrm{g}$ of Ca? 6.022 X 10²³. Homework Statement "Calcium crystallizes in a body-centered cubic structure. Each 40.078 grams of calcium has a mole of atoms. How many moles of calcium atoms do you have if you have 7.92 × 10²¹ atoms of calcium. The most abundant isotope, 40 Ca, as well as the rare 46 Ca, are theoretically unstable on energetic grounds, but their decay has not been observed. Problem 21 Which of the following has more atoms: 1.10 g of hydrogen atoms or $14.7 \mathrm{g}$ of chromium atoms? Explanation: The Periodic Table tells us that #6.022xx10^23# individual calcium atoms have a mass of #40.1*g# . Calcium weighs 40.08 grams per mole. 1.204 x 10²³ atoms of Au. (b) How many nearest neighbors does each Ca atom possess? 0 0. ... A prospector finds 39.39 g of pure gold. A calcium atom has 20 protons, 20 electrons and 20 neutrons. If I have 1405 mg of Fe₂O₃, how many moles of iron do I have? Definition: 1 gram atom of any element means mass of 1 mole of atoms of the element 1mol of Ca atoms has mass = 40.0g 1 gram atom of Ca has mass = 40.0g 5gram atoms of Ca has mass = 5 * 40.0 = 200.0g. Compared with a mole of neon, a mole of calcium contains. Trending Questions. Determine the volume of … The compound calcium nitrate consists of a total of nine atoms, including one atom of calcium, two of nitrogen and six of oxygen. Calcium (20 Ca) has 26 known isotopes, ranging from 35 Ca to 60 Ca. A gram mole (Calcium is daitomic) is 80 grams. Still have questions? emilyro emilyro There are five stable isotopes (40 Ca, 42 Ca, 43 Ca, 44 Ca and 46 Ca), plus one isotope (48 Ca) with such a long half-life that for all practical purposes it can be considered stable. Join Yahoo Answers and get 100 points today. How many atoms are there in total in a molecule of Calcium carbonate, - 5091164 Calcium's atomic mass is 40.08 g/mole, which rounds to 40 g/mole. Get your answers by asking now. We know that 113 mg is 0.113. Join. 2) To find the atoms, multiply 0.00282 moles x 6.022x10^23 atoms/mole = 1.70 x 10 ^21 atoms of calcium. Ask Question + 100. Calcium has atomic mass 40. Calcium nitrate has the molecular formula Ca(NO3)2 and a molecular weight of 164.08 grams per mole. has a mass of 80 grams (atomic mass) you can find how many atoms have a mass of 15 grams (I hope you know how to do it). We also know that 1 mole = 6.022 x 10^23 atoms. an equal number of atoms. 0.113 g / 40.08 g/mole = 0.00282 moles of calcium. 1) Find your moles. The atomic number of calcium is 20. Trending Questions. How many atoms of gold does he have? (The mass of one mole of calcium is 40.08 g.) with the right amount of sig figs. Avogadro number . Find an answer to your question how many atoms are in 115 grams of calcium kieara4life kieara4life 09/12/2016 Mathematics High School How many atoms are in 115 grams of calcium See answer kieara4life is waiting for your help. 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