Which one of the following changes would cause the pressure of a gas to double assuming temperature was held constant?

1 answer:

8 0

Answer: Increasing the volume of the gas would be the correct answer. Charles law of gas states this: 1) If the volume of a container is increased, the temperature increases.

2) If the volume of a container is decreased, the temperature decreases.

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Explanation:

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What is the molar concentration (in moles/L) of a solution made with 3.744 g of Mg(NO3)2 dissolved in enough water to make 50.0

Annette [7]

Answer:

The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is $0.5 \frac{moles}{L}$

Explanation:

Molarity or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$molarity=\frac{number of moles}{volume}$

In this case:

Mg: 24.3 g/mole
N: 14 g/mole
O: 16 g/mole

So, the molar mass of Mg(NO₃)₂ is:

Mg(NO₃)₂= 24.3 g/mole + 2*(14 g/mole + 3*16 g/mole)= 148.3 g/mole

So, if you have 3.744 g of Mg(NO₃)₂, you can apply the following rule of three: if 148.3 grams of Mg(NO₃)₂ are present in 1 mole, 3.744 grams in how many moles are present?

$moles=\frac{3.744 grams*1mole}{148.3 grams}$

moles= 0.025

Then you have:

number of moles=0.025
volume= 50 mL= 0.05 L (being 1,000 mL= 1 L)

Replacing in the definition of molarity:

$molarity=\frac{0.025 moles}{0.05 L}$

you get:

$molarity=0.5 \frac{moles}{L}$

The molar concentration of a solution made with 3.744 g of Mg(NO₃)₂ dissolved in enough water to make 50.0 mL of solution is $0.5 \frac{moles}{L}$

6 0

3 years ago

A compound with a formula mass of 42.08 amu is found to be 85.64 carbon and 14.36 hydrogen by mass find its molecular formula

Mars2501 [29]

brainly.com/question/8489178#respond

3 0

3 years ago

Part 1: Draw the major organic product for the proton transfer reaction between sodium hydride and ethanol; be sure to include l

valina [46]

Answer:

Major product ethoxide ion

Explanation:

Sodium hydride acts as a strong base towards ethanol.
Hydride ion abstracts one proton from -OH group in ethanol to produce sodium ethoxide and hydrogen gas.
It is an example of acid-base reaction where sodium hydride acts as a base and ethanol acts as an acid
Structure of major organic product i.e. ethoxide ion has been shown below.