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s2008m [1.1K]
3 years ago
10

Need help what is the answer

Chemistry
1 answer:
WARRIOR [948]3 years ago
6 0

Answer:

11.009306 or 11.009

Explanation:

boron 11 has atomic mass of 11.009306

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The recommended dietary allowance for calcium for teenage children is 1,300 mg per day.
PtichkaEL [24]

Answer:

c) 35 fl oz

Explanation:

Hello,

In this case, to compute the recommended amount of calcium that the teenager must drink, one performs the following relationship:

8.0-fl \ oz -->298mg\\x-->1,300mg

Solving for x, one gets:

x=\frac{8.0-fl \ oz *1,300mg}{298mg} \\x=35-fl \ oz

Best regards.

5 0
3 years ago
Can someone help me, please?
stellarik [79]
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3 years ago
What word or two-word phrase best describes the shape of the fluoroform molecule?
Vlad [161]

Answer : The shape of the fluoroform molecule is Tetrahedral.

Explanation :

First we have to calculate the Hybridization of the molecule by formula,

\text{Number of electrons} = \frac{1}{2}[V+H-C+A]

where,

V = Number of valence shell electron in central atom

H = Number of neighboring monovalent atom

C = charge of cation

A = charge of anion

The central atom in this molecule is Carbon, it has 4 electrons in their valence shell.

The neighboring monovalent atoms are one Hydrogen atom and three Fluorine atom.

There is no charge of cation and anion on the given molecule.

V = 4

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C = 0

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By the above hybridization formula, we get

\text{Number of electrons}= \frac{1}{2}[4+4-0+0] = 4

The number of electron pair = 4

The number of lone pair = 0

The number of electrons is 4, this means that the hybridization is sp^{3} and the geometry of the molecule is Tetrahedral.

The geometry of the molecule is shown below.


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3 years ago
Devices that allow you to do work in an easier way.​
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Answer:

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3 years ago
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How many valence electrons are in an atom of phosphorus?
Helen [10]

How many valence electrons are in an atom of phosphorus?

a. 2
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b. 3
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There are five valence electrons are in an atom of phosphorus. The answer is letter D. 

8 0
3 years ago
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