Respuesta :
Explanation:
Molar mass
The mass present in one mole of a specific species .
The molar mass of a compound , can easily be calculated as the sum of the all the individual atom multiplied by the number of total atoms .
(a) Limestone, CaCO₃
Molar mass of the atoms are -
Calcium , Ca = 40 g / mol
Carbon , C = 12 g/mol
Oxygen , O = 16 g/mol
Molecular mass of CaCO₃ = (40 g / mol ) + ( 12 g/mol ) + ( 3 * 16 g/mol ) = 100 g/mol.
(b) halite, NaCl
Molar mass of the atoms are -
Sodium , Na = 23 g/mol
Chlorine , Cl = 35.5
Molecular mass of NaCl = 23 + 35.5 = 58.5 g/mol .
(c) beryl, Be₃Al₂Si₆O₁₈
Molar mass of the atoms are -
Beryllium , Be = 9 g/mol
Aluminum , Al = 27 g/mol
Silicon , Si = 28 g/mol
Oxygen , O = 16 g/mol
Molecular mass of Be₃Al₂Si₆O₁₈ = ( 3* 9 ) + ( 2*27 ) + ( 6 * 28 ) + ( 18 * 16 ) = 537 g/mol .
(d) malachite, Cu₂(OH)₂CO₃
Molar mass of the atoms are -
Copper , Cu = 63.5 g/mol
Oxygen , O = 16 g/mol
Carbon , C = 12 g/mol
hydrogen , H = 1 g /mol
Molecular mass of Cu₂(OH)₂CO₃ = ( 2 * 63.5 ) + ( 5 * 16 ) + ( 2 * 1 ) + ( 1* 12 ) = 221 g/mol.
(e) turquoise, CuAl₆(PO₄)₄(OH)₈(H₂O)₄
Copper , Cu = 63.5 g/mol
Aluminum , Al = 27 g/mol
Phosphorous , P = 31 g/mol
Oxygen , O = 16 g/mol
hydrogen , H = 1 g /mol
Molecular mass of CuAl₆(PO₄)₄(OH)₈(H₂O)₄ =
( 63.5*1) + (6 *27) + (4* 31 ) + (28 *16 ) + ( 16 *1 ) = 813 g/mol.
