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Mashutka [201]
3 years ago
10

Given:

Chemistry
1 answer:
Jlenok [28]3 years ago
8 0

<em>Answer:</em>

<em>242 gram</em> of HF will be required for complete rex.

<em>Balance chemical equation:</em>

                                SiO2 + 4HF → SiF4 + 2H2O

<em>Data given</em>

                                mass of SiO2 = 182g

                                molar mass of SiO2=60.08

                                moles of SiO2 = mass/molar mass = 182/60.08 =3.02 moles

From balance chemcial equation

                                     SiO2 :  HF

                                         1    :     4

                                   3.02 =  4 × 3.02 = 12

mass of HF= no. of moles × molar mass

 mass of HF   = 12.08×20 =<em> 242 g</em>

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How many formula units are there in 212 grams of mgCl2
AleksandrR [38]

Formula units are there in 212 grams of MgCl₂ are 830.56

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Here given data is

MgCl₂ = 212 grams

1 mole of magnesium chloride has mass = 95.211 gram and contains 6.022×10²³formula units of magnesium chloride

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Start with 100.00 mL of 0.10 M acetic acid, CH3COOH. The solution has a pH of 2.87 at 25 oC. a) Calculate the Ka of acetic acid
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Answer: a) The K_a of acetic acid at 25^0C is 1.82\times 10^{-5}

b) The percent dissociation for the solution is 4.27\times 10^{-3}

Explanation:

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 cM              0             0

c-c\alpha        c\alpha          c\alpha

So dissociation constant will be:

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Give c= 0.10 M and \alpha = ?

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4 years ago
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