3 years ago

What is the percent by mass of phosphorus?

Chemistry

1 answer:

topjm [15]3 years ago

3 0

In what compund is it a part of?

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A chemist reacts 30.0 mL of 5.6 M HCl with an excess of Mg(OH)2 How many grams of magnesium will be produced

Mkey [24]

Answer:

2.042 g

Explanation:

The reaction that takes place is:

2HCl + Mg(OH)₂ → Mg²⁺ + 2Cl⁻ + 2H₂O

First we calculate how many HCl moles were added, using the given volume and concentration:

30 mL ⇒ 30 / 1000 = 0.030 L

5.6 M * 0.030 L = 0.168 mol HCl

Then we convert HCl moles into Mg²⁺ moles, using the stoichiometric coefficients:

0.168 mol HCl * $\frac{1molMg^{+2}}{2molHCl}$ = 0.084 mol Mg⁺²

Finally we convert Mg moles into grams, using its molar mass:

0.084 mol Mg⁺² * 24.305 g/mol = 2.042 g

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ANSWER FAST PLZ 25 POINTS!!!!!!!!!!!!!!!

Scilla [17]

Answer:

i think the answer is C)

Explanation:

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a sample of water with a mass of 648.00 kg at 298 K is heated with 87 kh of energy. the specific heat of water is 1 J-1 kg K-1.

Stels [109]

q = mCΔT

The correct specific heat capacity of water is 4.187 kJ/(kg.K).

ΔT = q/mC = 87 kJ/[648.00 kg x 4.187 kJ/(kg.K)] = 87 kJ/(2713 kJ/K) = 0.032 K

Tf = Ti + ΔT = 298 K + 0.032 K = 298.032 K

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What is the bond energy required to break one mole of carbon-carbon bonds

ArbitrLikvidat [17]

Answer:

<h2>100 kcal of bond energy</h2>

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What is the difference between soluble and insoluble

klemol [59]

Soluble means it can be dissolved

Insoluble means it can't be dissolved

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