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Elenna [48]
3 years ago
7

Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.

Chemistry
2 answers:
geniusboy [140]3 years ago
8 0
No' of molecules divide by avogadro number , 6×6.023×10^23 so (2.2×10^22)÷(6.023×10^23)
= 0.03653 moles
moles × Molar mass = mass
n×Mr=m
0.03653×40 = 1.46 grams
yuradex [85]3 years ago
6 0

Answer:

1.46 g

Explanation:

For this exercise we need the Avogadro’s number that represents the number of molecules that has a mole of a substance and is value is 6.022x10^23. That is to say that 1 mole of NAOH has  6.022x10^23 molecules and by a rule of three we have:

1 mole NaOH ----------- 6.022x10^23 molecules

         X             ----------- 2.20x10^22 molecules

X=\frac{(2.20x10^{22}molecules)(1moleNaOH)}{6.022x10^{23}molecules}

X = 0.0365 moles NaOH

Then, 2.20x10^22 molecules of NaOH represent 0.0365 moles of NaOH.

To find the mass we use another rule of three with the NaOH molar mass:

1 mole NaOH             ------ 40.0 g

0.0365 moles NaOH ------ X

X=\frac{(0.0365 moles NaOH)(40.0 g)}{1 mole NaOH}

X= 1.46 g

So, 0.0365 moles of NaOH have a mass of 1.46 g or 2.20 ×10^22 molecules of NaOH have a mass of 1.46 g

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1) Compund Ir (x) O(y)

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4) Mass of oxygen = mass of iridum oxide - mass of iridium = 1.47g - 1.26g = 0.21g

5) Convert grams to moles

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A solution has a pOH of 7. 1 at 10∘c. Then the pH of the solution given that kw=2. 93×10−15 at this temperature is 7.4 .

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