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3 years ago

When 5.175 g of lead are heated at 300 C the lead reacts with the oxygen in the air to

Chemistry

2 answers:

TEA [102]3 years ago

4 0

$2Pb+O_2=2PbO$ if the lead has valence 2 (I'm not totally certain of that, lol)

Scorpion4ik [409]3 years ago

4 0

Answer:

Mass of oxygen used is 5.708 – 5.175 g = 0.533 g Moles of lead reacting = (5.175/207) mol = 0.025 mol Moles of oxygen reacting = (0.533/32) mol = 0.0167 mol ∴0.025 mol of Pb react with 0.0167 mol of O2to give product ∴1.5 mol of Pb react with 1 mol of O2to give product ∴3 mol of Pb react with 2 mol of O2to give product 3Pb+ 2O2→Pb3O4You do not have the information to write the full equation but as you know there is only one product and this has 3 lead atoms and 4 oxygen you can suggest a formula.

Explanation:

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What is the concentration (M) of CH3OH in a solution prepared by dissolving 34.4 g of CH3OH in sufficient water to give exactly

bonufazy [111]

Answer:

4.67M

Explanation:

The concentration of methanol (CH3OH) can be calculated using the following:

Molarity (M) = number of moles(n)/volume(v)

However, mole is not given. It can be obtained by using:

Mole = mass / molar mass

Where; mass = 34.4g

Molar mass (MM) of CH3OH is:

= 12 + 1(3) + 16 + 1

= 12 + 3 + 17

= 32g/mol

mole = 34.4/32

mole = 1.075mol

The volume needs to be converted to L by dividing by 1000

230mL = 230/1000

= 0.230L

Molarity = mol/volume

Molarity = 1.075/0.230

Molarity = 4.6739

Molarity = 4.67M

The concentration of CH3OH in solution is 4.67M

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3 years ago

Aluminum reacts with iron nitrate to form aluminum nitrate and iron. What is the

Lelechka [254]

The reactants are aluminum and iron nitrate.

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2 years ago

How many moles are contained in 2.0 L of N2 at standard temperature and pressure.

GuDViN [60]

0.091 moles are contained in 2.0 L of N2 at standard temperature and pressure.

Explanation:

Data given:

volume of the nitrogen gas = 2 litres

Standard temperature = 273 K

Standard pressure = 1 atm

number of moles =?

R (gas constant) = 0.08201 L atm/mole K

Assuming nitrogen to be an ideal gas at STP, we will use Ideal Gas law

PV = nRT

rearranging the equation to calculate number of moles:

PV = nRT

n = $\frac{PV}{RT}$

putting the values in the equation:

n = $\frac{1X2}{0.08201 X 273}$

n = 0.091 moles

0.091 moles of nitrogen gas is contained in a container at STP.

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3 years ago

Which is a binary ionic compound?

e-lub [12.9K]

A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal.

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3 years ago

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The oceanic crust is made primarily from this type of rock. A) basalt B) halite C) granite D) limestone

masya89 [10]

The answer is A. Basalt rock.

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3 years ago