The substance which is a combination of different atoms is
compound
compound is substance formed when two ore more different atoms are chemically bonded together. example of compound H20 which is made up of which is made of two atoms of hydrogen and one atom of oxygen joined by a covalent bond to form water(H20)
Explanation:
The molar mass of a substance is the mass in grams of one mole of the substance.
When dealing with compounds the molar mass is the sum of the of its component atomic masses and expresses in grams per mole;
Given compounds;
Fe₂O₃ and Al₂O₃
Atomic mass;
Fe = 55.845g/mol
Al = 26.9185g/mol
O = 15.9994g/mol
Molar mass of Fe₂O₃ = 2(55.845) + 3 (15.9994) =
111.69 + 47.9982 = 159.7g/mol
Molar mass of Al₂O₃ = 2(26.9185) + 3(15.9994) = 53.837+47.9982
= 101.8g/mol
learn more:
Molar mass brainly.com/question/2861244
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It is a good idea because when mercury heats up, the molecules spread farther apart. Therefore, making them look to have expanded. Thermometers that are digital use a sensor to, as you would say feel the temperature around it.
Answer:81.6%
Explanation:
Mass of CaCO3=4.010 g
Molar mass of CaCO3= 40+12+(16×3) = 100 g/mol.
Recall: number of moles(n)= mass÷ molar mass.
n=4.010÷100 = 0.0401 mol.
Molar mass of CaCl2 = 40+71= 111 g/mol.
Number of mol of CaCl2 = 5.455÷111= 0.04914 g/mol.
Mass of CaCl2 = 0.0401 × 111 = 4.4511 g of CaCl2.
Percent by mass of CaCl2 = (4.4511÷5.455) × 100
= 0.815967 ×100 = 81.5967%
Approximately; 81.6%.
I think it is 12........................