Multiple Choice
How many moles of beryllium (Be) are present in 1.00 g of the element? (Atomic mass of Be = 9.01 g/mol)
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- 1. Intro to General Chemistry3h 48m
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2. Atoms & Elements
Mole Concept
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many silicon atoms are present in 2 molecules of SiH_4?
A
1
B
2
C
8
D
4
Verified step by step guidance1
Identify the chemical formula of the molecule given, which is SiH_4. This means each molecule contains 1 silicon (Si) atom and 4 hydrogen (H) atoms.
Determine the number of silicon atoms in one molecule of SiH_4. Since the formula shows 1 Si atom per molecule, there is exactly 1 silicon atom in one molecule.
Multiply the number of silicon atoms per molecule by the number of molecules given. Here, multiply 1 silicon atom by 2 molecules:
\[ 1 \times 2 = 2 \]
Conclude that there are 2 silicon atoms present in 2 molecules of SiH_4.
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