Answer:
n=m/M, so
Explanation:
Molar mass of Na is 22,9... so rounded to 23
n=42g/23g/mol
=1,826mol
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
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It is A. subject to change if new information is discovered
If a sample of gas is a 0.622-gram, volume of 2.4 L at 287 K and 0.850 atm. Then the molar mass of the gas is 7.18 g/mol
<h3>What is an ideal gas equation?</h3>
The ideal gas law (PV = nRT) relates to the macroscopic properties of ideal gases.
An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given :
The ideal gas equation is given below.
n = PV/RT
n = 86126.25 x 0.0024 / 8.314 x 287
n = 0.622 / molar mass (n = Avogardos number)
Molar mass = 7.18 g
Hence, the molar mass of a 0.622-gram sample of gas having a volume of 2.4 L at 287 K and 0.850 atm is 7.18 g
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Heat the sulfuric acid solution and adding copper carbonate in it.
<h3>Improvement require in this experiment</h3>
The method could be improved by heating sulfuric acid solution and add copper carbonate into the solution of sulfuric acid. Add the copper carbonate until it is present in excess amount. After that filter the extra amount of copper carbonate so in this way the blue copper sulfate crystals are produced.
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