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bulgar [2K]
3 years ago
10

What mass of magnesium phosphate contains 15g of magnesium?

Chemistry
1 answer:
tekilochka [14]3 years ago
7 0

81.875 g of magnesium phosphate Mg₂(PO₄)₃

Explanation:

The chemical formula of magnesium phosphate is Mg₃(PO₄)₂.

molar mass of Mg₃(PO₄)₂ = atomic weight of Mg × 3 + atomic weight of P × 3 + atomic weight of O × 3 × 4

molar mass of Mg₃(PO₄)₂ = 24 × 3 + 31 × 2 + 16 × 2 × 4 = 262 g/mole

Knowing the molar mass of Mg₃(PO₄)₂, we devise the following reasoning:

if in          262 g of Mg₂(PO₄)₃ there are 48 g of Mg

then in     X g  of Mg₂(PO₄)₃ there are 15 g of Mg

X = (262 × 15) / 48 = 81.875 g of Mg₂(PO₄)₃

Learn more about:

molar mass

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A 1 liter solution contains 0.247 M nitrous acid and 0.329 M sodium nitrite. Addition of 0.271 moles of calcium hydroxide will:
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Answer:

a. Raise the pH slightly

Explanation:

We know that

Pka of HNO2/KNO2 =3.39

Moles of HNO2 in the buffer=0.247 mol/L×1L=0.247 moles

Moles of NO2-=0.329mol/L×1L=0.329 moles

If 0.271 moles of Ca(OH)2 is added it will neutralise 0.136 moles of acid ,HNO2,remaining HNO2=0.247-0.136=0.111 moles

Moles of NO2- will increase as 0.0333 moles Ca(NO)2 will be formed =0.0333+0.036=0.0693 moles

pH=pka+log [base]/[acid]      {henderson -hasselbach equation}

=3.39+log (0.0693/0.0317)=3.39+0.34=3.73

pH=3.73

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3 years ago
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A 23.8 mL sample of HCl of unknown concentration is neutralized by 5.45 mL of 0.331 M Ca(OH)2. What is the concentration of the
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Answer:

9.0 moles of CaO

Explanation:

We have the reaction equation as follows;

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Now we know from the equation that;

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1. In the investigation of an unknown alcohol, there was a positive Jones test and a negative Lucas test. What deductions may be
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Answer:

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2. No reaction (See the attached drawing)

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