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3 years ago

Calculate the mass of chromium produced from 5 kg of Cr2O3.

Chemistry

1 answer:

BabaBlast [244]3 years ago

6 0

Answer:

3421.34 g

Explanation:

2Cr2O3 → 4Cr + 3O2

From the equation abve;

2 mol of Cr2O3 produces 4 mol of Cr

Converting 5 kg of Cr2O3 to mol;

Number of moles = Mass / Molar mass = 5000 / 151.99 g/mol = 32.9 mol

2 mol = 4 mol

32.9 mol = x

Solving for x;

x = 32.9 * 4 / 2

x = 65.8 mol

Mass = Number of moles * Molar mass

Mass = 65.8 * 51.9961

Mass = 3421.34 g

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The area of a rectangle is 50 m2<br> If the height is 4 m, what is the<br> base?

Oliga [24]

Area = height × base

50 = 4 × base

Thus

base = 50/4

Base = 12.5 m

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3 years ago

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Histones are proteins that control gene function by attaching through salt links to exterior regions of DNA. Name an amino acid

sweet-ann [11.9K]

Histones are proteins that control gene function by attaching salt links to exterior regions of DNA. Argentines is an amino acid whose side chain is often found on the exterior of histones

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The eight-protein complex known as a histone octamer is what makes up the nucleosome core particle. Each of the four main histone proteins is present in two copies in this structure (H2A, H2B, H3 and H4). When a tetramer, which has two copies of both H3 and H4, interacts with two H2A/H2B dimers, the octamer forms.

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2 years ago

what is a mole and why does a mole of magnesium and a mole of carbon weigh different they have the same number of atoms?

timofeeve [1]

~ A mole is a unit of 6*10^23.

~One mole of carbon atoms has a mass of exactly 12 g.

~ Because magnesium atoms each have twice the mass of carbon atoms ( 24Mg compared with 12C), one mole of magnesium has a mass of 24 g.

~ Rather, one mole of any element has a mass in grams that is equal to its relative atomic mass.

8 0

3 years ago

Commercially available aqueous nitric acid has a density of 1.42 g/mL and a concentration of 16 M. Calculate the mass percent of

luda_lava [24]

Answer:

The mass % of HNO3 in the solution is 71.0 %

Explanation:

Step 1: Data given

Density of HNO3 = 1.42 g/mL

Concentration = 16 M = 16 mol /L

Molar mass HNO3 = 63.01 g/mol

Assume the volume = 1L or 1000 mL

Step 2: Calculate mass of the solution

Mass = density * volume

Mass = 1.42 g/mL * 1000 mL

Mass = 1420 grams

Step 3: Calculate moles HNO3

Moles = molarity * volume

Moles = 16 M * 1L

Moles = 16 moles

Step 4: Calculate mass HNO3

Mass HNO3 = moles * molar mass

Mass HNO3 = 16.0 moles * 63.01 g/mol

Mass HNO3 = 1008.16 grams

Step 5: Calculate the mass percent

mass % = (1008.16 grams / 1420 grams) *100%

mass % = 71.0 %

The mass % of HNO3 in the solution is 71.0 %

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3 years ago

Can yall answer the question on the image PLEASE

Brut [27]

Answer is 67.8%

To find the percent yield the equation is actual yield over theoretical yield, and multiply by 100. In this problem it is 4.06996 / 6 = 0.678 x 100 = 67.8%

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3 years ago