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How would you calculate the mass in grams of 1.24 moles of beryllium?
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2. Atoms & Elements
Calculating Molar Mass
객관식
Which of the following is the molar mass of BF_3?
A
48.81 g/mol
B
67.81 g/mol
C
20.81 g/mol
D
86.81 g/mol
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검증된 단계별 안내1
Identify the elements present in the compound BF_3, which are boron (B) and fluorine (F).
Determine the number of atoms of each element in one molecule of BF_3: 1 atom of boron and 3 atoms of fluorine.
Find the atomic masses of each element from the periodic table: boron (approximately 10.81 g/mol) and fluorine (approximately 18.998 g/mol).
Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms: for boron, multiply 10.81 g/mol by 1; for fluorine, multiply 18.998 g/mol by 3.
Add the total masses of boron and fluorine together to get the molar mass of BF_3 using the formula: \(\text{Molar mass of BF}_3 = (1 \times 10.81) + (3 \times 18.998)\) g/mol.
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