need help with chemical formulas? Chemistry work details below:

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DETERMINING CHEMICAL FORMULAS PROMPT:

In this lesson, you learned about the empirical formula and how it is related to molecular formulas. Now you will demonstrate this knowledge by responding to the following prompt. Make sure you are showing all of your work. A compound containing sodium, chlorine, and oxygen is 25.42% sodium by mass. A 3.25 g sample gives 4.33 × 1022 atoms of oxygen. Explain the steps you need to take to find the empirical formula with the given information, then find the empirical formula."Make sure to show your work, and your answers should be provided with the correct amount of significant figures." YOU WILL RECEIVE A SCORE REDUCTION IF THE ABOVE REQUIREMENTS ARE NOT MET.





CHEMICAL FORMULAS PRACTICE:

1) Which of the following compounds does not contain a polyatomic ion?


sodium carbonate


sodium sulfate


sodium sulfite


sodium sulfide


2) The correct formula for ammonium phosphate is ________.

(NH4)3PO4

(NH4)2PO4

NH4PO4

NH4(PO4)2


3) When writing the formula for a compound that contains a polyatomic ion, ________.


write the anion’s formula first


use superscripts to show the number of polyatomic ions present


use parentheses if the number of polyatomic ions is greater than 1


always place the polyatomic ion in parentheses


4) The correct name for NH4OH is ________.

ammonium carbonate

ammonium hydroxide

ammonium acetate

ammonium nitrate


5) Which of the following is the correct formula for iron (III) sulfate?

Fe3SO4

Fe3(SO4)3

Fe2(SO4)3

3FeSO4


6) The molecular formula for acetylene is C2H2. The molecular formula for benzene is C6 H6+. The empirical formula for both is ________.

CH

C2H2

C6H6

(CH)2

7) Which of the following shows the percentage composition of H2SO4?

2.5% H, 39.1% S, 58.5% O

2.1% H, 32.7% S, 65.2% O

28.6% H, 14.3% S, 57.1% O

33.3% H, 16.7% S, 50% O


8) Which of the following compounds has the highest percentage of oxygen?

CH4O

C02

H2O

Na2CO3


9) The empirical formula for a compound that is 1.2% H, 42.0% Cl, and 56.8% O is ________.

HClO

HClO2

HClO3

HClO4

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