The answer to this question is toaster, it starts as electric, then heats up and turns to heat energy to heat up your food.
Answer:
C) tellurium (Te) is the correct answer.
Answer:
B
Explanation:
Elements are atoms and all atoms have mass and occupy space
<span>Na + Cl = NaCl
answer : </span><span>synthesis reaction .
hope this helps!
</span>
Answer : The question is incomplete.
The complete question will be -
A chemical engineer determines the mass percent of iron in an ore sample by converting the Fe to
![Fe^{2+}](https://tex.z-dn.net/?f=%20Fe%5E%7B2%2B%7D%20)
in acid and then titrating the
![Fe^{2+}](https://tex.z-dn.net/?f=%20Fe%5E%7B2%2B%7D%20)
with Mn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
<span>.
A 1.3909 g sample was dissolved in acid and then titrated with 21.63 mL of 0.03709 M KMn</span>
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
<span>. The balanced equation is given below. </span>
8
![H^{+}](https://tex.z-dn.net/?f=%20H%5E%7B%2B%7D%20)
(aq) + 5
![Fe^{2+}](https://tex.z-dn.net/?f=%20Fe%5E%7B2%2B%7D%20)
(aq) + Mn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
(aq) → 5
![Fe^{3+}](https://tex.z-dn.net/?f=%20Fe%5E%7B3%2B%7D%20)
(aq) +
![Mn^{+2}](https://tex.z-dn.net/?f=%20Mn%5E%7B%2B2%7D%20)
+(aq) + 4
![H_{2}O](https://tex.z-dn.net/?f=%20H_%7B2%7DO%20)
<span>(l) </span>
<span>Calculate the mass percent of iron in the ore. </span>
______%
Calculation : Given :- weight of sample - 1.3909 g,
Moles of KMn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
- 0.04462 m
Volume of KMn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
- 21.63 mL
On solving we get,
(21.63 mL KMn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
/ 1.3909g sample) x (1L / 1000mL) x (0.04462mol KMn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
/ L KMn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
) x (5 mol Fe2+ / 1 mol KMn
![O^{4-}](https://tex.z-dn.net/?f=%20O%5E%7B4-%7D%20)
) x (55.845g
![Fe^{2+}](https://tex.z-dn.net/?f=%20Fe%5E%7B2%2B%7D%20)
/ mol
![Fe^{2+}](https://tex.z-dn.net/?f=%20Fe%5E%7B2%2B%7D%20)
) x 100% = 19.37%
So the concentration of the ore is
19.37%