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Lina20 [59]
3 years ago
6

11) Identify the number of elements and the number of atoms present in the chemical formula. NaHCO ²

Chemistry
2 answers:
monitta3 years ago
5 0

Answer:

4;6

Explanation:

because there are four elements

Llana [10]3 years ago
5 0
The answer will be .. A . 4;6

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What is the molarity of 50.84 g of Na2CO3 dissolved in 0.400 L solution?
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Answer:

1.20 M

Explanation:

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Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sa
Lapatulllka [165]

I think the correct answers are X2Y and X3Y, X2Y5 and X3Y5, and X4Y2 and X3Y, for the following reason: 

If you look at the combining masses of X and Y in each of the two compounds, 

The first compound contains 0.25g of X combined with 0.75g of Y 
so the ratio (by mass) of X to Y = 1 : 3 

The second compound contains 0.33 g of X combined with 0.67 g of Y 
so the ratio (by mass) of X to Y = 1 : 2 

Now, you suppose to prepare each of these two compounds, starting with the same fixed mass of element Y ( I will choose 12g of Y for an easy calculation!) 

The first compound will then contain 4g of X and 12g of Y 
The second compound will then contain 6g of X and 12g of Y 

<span>The ratio which combined the masses of X and the fixed mass (12g) of Y
= 4 : 6 
<span>or 2 : 3 </span>

So, the ratio of MOLES of X which combined with the fixed amount of Y in the two compounds is also = 2 : 3 </span>

The two compounds given with the plausible formula must therefore contain the same ratio.

8 0
3 years ago
How many significant figures are in 1.009 L
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Numbers above zero are significant, as well as any zeros that appear in between two non-zero numbers.
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Which statement about the elements in the periodic table is true
egoroff_w [7]

A. The number of valence electrons increases as atomic mass increases. == Generally true for the representative elements since atomic mass generally increases with increasing Z.  

B. The reactivity of alkali metals increases as atomic mass increases. == True. Atomic mass increases down the column and so does reactivity  

C. The reactivity of the halogens increases as atomic mass increases. == False. Reactivity decreases down the column.  

D. The number of valence electrons decreases across a period. == False. In general, the number of valence electrons increases across a period, particularly for the representative elements.

6 0
3 years ago
Read 2 more answers
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