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4 years ago

What is the percent composition of chromium in BaCrO4

Chemistry

1 answer:

Allushta [10]4 years ago

4 0

The answer is: the percent composition of chromium is 20.52%.

Ar(Cr) = 52; atomic mass of chromium.

Mr(BaCrO₄) = 253.3; molecular mass of barium chromate.

ω(Cr) = Ar(Cr) ÷ Mr(BaCrO₄) · 100%.

ω(Cr) = 52 ÷ 253.3 ·100%.

ω(Cr) = 20.52%; the percent composition of chromium in barium chromate.

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A 0.450 g sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl ( aq ) . The equation for the reaction is CaCO3 ( s )

Lapatulllka [165]

Answer:

The mass percentage of CaCO3(s) in the sample is 83.4%

Explanation:

CaCO₃ + 2HCl → CaCl₂ + H2O + CO₂

Let's find out the moles of each reactant:

[HCl] = 0.150 mol/L

Molarity . volume = moles

0.150 m/L . 0.050L = 7.5x10⁻³ moles HCl

Molar mass of CaCO₃ =100.08 g

Moles of CaCO₃ = Mass / Molar mass

0.450 g/100.08 g = 4.49x10⁻³ moles of salt

Ratio is 1:2

If 2 moles of HCl react with 1 mol of salt

7.5x10⁻³ moles of HCl react with 7.5x10⁻³ / 2 = 3.75x10⁻³ moles

We must find out the mass

Moles of CaCO₃ . Molar mass CO₃ = 0.3753 g

So now, the mass percentage of salt will be

0.450g ___ 100%

0.3753 g ____ (0.3753 .100 )/0.450 =83.4 %

6 0

3 years ago

What type of energy does a ball falling through the air have?

Sveta_85 [38]

Answer:

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3 years ago

The anesthetic procaine hydrochloride is often used to deaden pain during dental surgery. the compound is packaged as a 10.% sol

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10% solution means= $\frac{10g}{100mL}$

= $\frac{0.1g}{1mL}$

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If the dentist inject 0.3 mL, that is equal to 0.3× 100 mg.

If the dentist inject 0.3 mL, that is equal to 30 mg.

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3 years ago

What is the volume of 25 g iodine, density = 4.93 g/cm^3??

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