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3 years ago

O que é umidade absoluta?

2 answers:

5 0

A umidade absoluta é a medida do vapor de água (umidade) no ar, independentemente da temperatura. É expresso como gramas de umidade por metro cúbico de ar (g / m3).

Nezavi [6.7K]3 years ago

5 0

Humidity is the amount of water vapor present in the air. Water vapor is the gaseous state of water and is invisible to the human eye. Humidity indicates the likelihood of precipitation, dew, or fog.

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Explain why hydrogen and oxygen are considered elements whereas water is not considered an element.

Ghella [55]

Elements are the simplest building blocks you can break matter down into using purely chemical methods. They are a pure substance made up from only one type of atom.

When you mix elements together these form compounds. The important difference is that as they are a mixture of more than one type of element, they CAN be broken down into more simple substances using chemical means!

As such Hydrogen or Oxygen cannot be simplified chemically (they are therefore elements), however dihydrogen monoxide (H2O or water) is a mixture of these elements that can be broken down using chemical means and so is a compound.

5 0

4 years ago

Read 2 more answers

What mass of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution?

inna [77]

Answer:

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

Explanation:

Molarity is a measure of the concentration of a solute in a solution that indicates the amount of moles of solute that appear dissolved in one liter of the mixture. In other words, molarity is the number of moles of solute that are dissolved in a given volume.

The Molarity of a solution is determined by the following expression:

$Molarity=\frac{number of moles of solute}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$

In this case:

Molarity: 1.56 M= 1.56 $\frac{moles}{liter}$
Number of moles of calcium chlorine= ?
Volume= 2.657 liters

Replacing:

$1.56 M=\frac{Number of moles of calcium chlorine}{2.657 liters}$

Solving:

Number of moles of calcium chlorine= 1.56 M* 2.657 liters

Number of moles of calcium chlorine= 4.14 moles

In other side, you know:

Ca: 40 g/mole
Cl: 35.45 g/mole

Then the molar mass of the calcium chloride CaCl₂ is:

CaCl₂= 40 g/mole + 2* 35.45 g/mole= 110.9 g/mole

Now it is possible to apply the following rule of three: if in 1 mole there is 110.9 g of CaCl₂, in 4.14 moles of the compound how much mass is there?

$mass=\frac{4.14 moles*110.9g}{1 mole}$

mass= 459.126 g

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

3 0

3 years ago

How many liters in .75 moles of methane gas at stp?

marin [14]

At STP 1 mol of an ideal gas has a volume of 22.4 L. We assume (from the question) that the methane has an ideal behavior. Hence if 1 mole of an ideal gas ccupies a volume of 22.4 L Then 0.75 mole occupies X Hence X * 1 = 0.75 * 22.4 X = 16.8L

6 0

3 years ago

The main two characteristics that describe any igneous rock are

amm1812

All igneous rocks are defined by texture and gas content. Hope this helped, my man.

7 0

3 years ago

HELP ASAP 50-50 CHANCE

docker41 [41]

Answer: The answer is A, A new element or different atom formed from the original two.

Hope this helps! :D

-TanqR

4 0

4 years ago