Pitchblende is ore of _____.<br><br> plutonium<br> curium<br> uranium<br> radium

¿Que es la materia? ¿y los materiales? Dar ejemplos de diferentes materiales. Pliss

Fudgin [204]

<span>Principalmente gases y sólidos. <span>Usualmente metal tal como hierro, dióxido de carbono y oxígeno.</span></span>

3 0

3 years ago

What is the density of an object that has a volume of 20.0 cm^3 and a mass of 40.0 grams?

dusya [7]

The density of an object that has a volume of 20.0 cm^3 and a mass of 40.0 grams is 2 g/cm^3

Mass

The definition of the word "mass" is the measurement of the amount of matter or substance, that is contained in an item. An object's mass increases with the amount of matter it contains.

<h3>Volume</h3>

The amount of three-dimensional space that an object or shape takes up is known as its volume. It is typically expressed in cubic units.

<h3>Density</h3>

The quantity of mass present in a substance at a given volume is referred to as density. The fundamental property of a substance is what explains how mass and volume are related (space occupied). It establishes how closely an object's molecules fit into the available space.

given that,

mass = 40.0 grams

volume =20.0 cm^3

Density =?

Density = mass / volume

=40.0 grams/20.0 cm^3

= 2 g/cm^3

The density of an object that has a volume of 20.0 cm^3 and a mass of 40.0 grams is 2 g/cm^3

Learn more about Density here:-

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6 0

2 years ago

Gaseous methane (CH4) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O) . If 0

UkoKoshka [18]

Answer: The percent yield of water is 84.72 %

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For methane:

Given mass of methane= 0.16 g

Molar mass of methane = 16 g/mol

Putting values in equation 1, we get:

$\text{Moles of methane}=\frac{0.16g}{16g/mol}=0.01mol$

For oxygen gas:

Given mass of oxygen gas = 0.25 g

Molar mass of oxygen gas = 32 g/mol

Putting values in equation 1, we get:

$\text{Moles of oxygen gas}=\frac{0.25g}{32g/mol}=0.008mol$

The chemical equation for the reaction is

$CH_4+2O_2\rightarrow CO_2+2H_2O$

By Stoichiometry of the reaction:

2 moles of oxygen gas reacts with 1 mole of methane

So, 0.008 moles of oxygen gas will react with = $\frac{1}{2}\times 0.008=0.004mol$ of methane

As, given amount of methane is more than the required amount. So, it is considered as an excess reagent.

Thus, oxygen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of oxygen gas produces = 2 moles of water

So, 0.008 moles of oxygen gas will produce = $\frac{2}{2}\times 0.008=0.008moles$ of water

Mass of water= $moles\times {\text{Molar Mass}}=0.008\times 18=0.144g$

To calculate the percentage yield of titanium (IV) chloride, we use the equation:

$\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

Experimental yield of water = 0.122

Theoretical yield of water = 0.144 g

Putting values in above equation, we get:

$\%\text{ yield of water}=\frac{0.122g}{0.144g}\times 100\\\\\% \text{yield of water}=84.72\%$

Hence, the percent yield of water is 84.72%.

7 0

3 years ago

An entire system of energy (potential, kinetic, and dissipated) starts

krok68 [10]

It’s c
Explaination : i just trusted my gut

5 0

3 years ago

what does diving 30m below sea level affect our bodies more then being in a building 30m above sea level?

Komok [63]

Because of the pressure. No oxygen in the water, however there is oxygen above the sea level. Thus, causing pressure to our bodies.

7 0

4 years ago

Pitchblende is ore of _____. plutonium curium uranium radium