Select the true statements.
1 answer:
Answer:
A) and D)
Explanation:
A) BF 3 has a trigonal planar shape
TRUE.
BF₃ has three bonding pairs and no lone pairs. According to VSEPR theory, it is an AX₃ molecule with trigonal planar geometry.
B) Molecules with three outer atoms always have a trigonal planar shape.
False
NH₃ has three outer atoms but a trigonal pyramidal shape.
C) NH₃ has a trigonal planar shape
False.
NH₃ has three bonding pairs and one lone pair. According to VSEPR theory, it is an AX₃E molecule with trigonal bipyramidal geometry.
D) Trigonal planar molecules have three regions of high-electron density around the central atom
TRUE
The regions of high-electron density are the three bonding pairs.
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Note down the formula below
Mass of the compound
Mass % of Hydrogen:-
Mass % of Oxygen:-
Answer:
324.18 g/mol
Explanation:
Let the molecular mass of the antimalarial drug, Quinine is x g/mol
According to question,
Nitrogen present in the drug is 8.63% of x
So, mass of nitrogen =
Also, according to the question,
2 atoms are present in 1 molecule of the drug.
Mass of nitrogen = 14.01 amu = 14.01 g/mol (grams for 1 mole)
So, mass of nitrogen = 14.01×2 = 28.02
These 2 must be equal so,
solving for x, we get:
<u>x = 324.18 g/mol</u>
<u>Answer:</u> The atomic symbol of the given element is
<u>Explanation:</u>
The general isotopic representation of an element is given as:
where,
Z represents the atomic number of the element
A represents the mass number of the element
X represents the symbol of an element
For the given isotope: 130-iodine
Mass number = 130
Atomic number = 53
Hence, the atomic symbol of the given element is