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padilas [110]
3 years ago
12

Calculate the percent composition by mass of each element in Al(OH)3. Use at least three significant figures.

Chemistry
2 answers:
motikmotik3 years ago
7 0

Answer:

nope nope nope nope nope nope nope nope

serg [7]3 years ago
4 0

Answer:

Al= (27/78)x100

Al= 34.6%

O= (48/78)x100

O= 61.5%

H= (3/78)x100

H= 3.85%

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A 1300 mL sample of gas with a molar mass of 71.0 g/mol at STP has what density?
Blizzard [7]

Answer:

0.055g/mL

Explanation:

Data obtained from the question include:

Molar Mass of the gass sample = 71g/mol

Volume of the gas sample = 1300 mL

Density =?

The density of a substance is simply mass per unit volume. It is represented mathematically as:

Density = Mass /volume.

With the above equation, we can easily obtain the density of sample of gas as illustrated below:

Density = 71g / 1300 mL

Density = 0.055g/mL

Therefore, the density of the gas sample is 0.055g/mL

6 0
3 years ago
Luke and Sian want to plant a vegetable garden in their yard. A soil testing kit measures the soil pH at 5.0, but the lettuce th
dexar [7]

Answer:

So, Luke and Sian has to increase the pH of the soil by adding base to it.

Explanation:

The pH is defined as the negative logarithm of the hydrogen ion concentration in their aqueous solution.

pH=-\log[H^+]

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The pH of the soil after testing it on a kit comes out be 5.0, but they both need pH of the soil to 6.5.

Comparison of pH of soil:

  =  5.0 < 6.5

= High hydrogen ion concentration > High hydrogen ion concentration

So, Luke and Sian has to increase the pH of the soil by adding base .Doing so will decrease the hydrogen ion concentration in the soil (where as addition of acid lower the pH of soil).

4 0
3 years ago
The total number of electrons in the outer shell of a sodium atom is?<br>A. 1<br>B.2<br>C.8<br>D.18​
mrs_skeptik [129]

Answer:

1

Explanation:

outershell atoms of an element are also known as valency of that element

so the valency and number of elctron in the outershell of a sodium atom is +1.

hope this will help

mark me as brilliant

7 0
3 years ago
Which of the following is true for compounds?
soldi70 [24.7K]
Compound are formed by two or more elements chemically combined. For example: H^2O is the water formula, this is a compound because you two elements which are Hydrogen and Oxygen and together they form a compound. The (^2) is the amount of atoms the formula has, in this case Hydrogen has two atoms and Oxygen is neutral.
4 0
3 years ago
A general change, such as increasing or decreasing numbers
Blababa [14]

c)pattern

Explanation:

A general change such as increasing or decreasing numbers is called a pattern. A pattern shows a structured way of implementing a change.

  • Patterns can be a form of increment in values by adding a particular number at intervals.
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  • Patterns can provide insight into understanding a number system or a group of numbers.  
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Learn more:

Patterns brainly.com/question/4694425

#learnwithBrainly

7 0
3 years ago
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