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4 years ago

What do a mole of magnesium and a mole of iron have in common

Chemistry

1 answer:

lukranit [14]4 years ago

7 0

What they have in common is that they both have the same number of atoms. Hope this helps. :)

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A thermometer reads a temperature to be 38.0 °C. What is the temperature in

12345 [234]

Answer:

$\boxed {\tt 311.15 \ K}$

Explanation:

To convert degrees Celsius to Kelvin, use the following formula.

$K= \textdegree C +273.15$

Since we are trying to find 38 degrees Celsius in Kelvin, so we should substitute 38 in for degrees Celsius.

$\textdegree C =38$

$K=38+273.15$

Add 38 and 273.15.

$K=311.15$

38 degrees Celsius is equal to 311.15 Kelvin

7 0

3 years ago

How are Newton's three laws of motion related

OLga [1]

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

6 0

3 years ago

Read 2 more answers

A student has two solutions of a substance. Solution-1: 25M, 400mL, and Solution-2: 30M, 300 ml. What is the molarity of the fin

castortr0y [4]

Answer:

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

Explanation:

Yo know:

Solution-1: 25M, 400mL
Solution-2: 30M, 300 mL

Molarity being the number of moles of solute per liter of solution, expressed by:

$Molarity (M)= \frac{number of moles}{volume}$

You can determine the number of moles that are mixed from each solution as:

Number of moles= Molarity*Volume

So, being 1 L=1000 mL, for each solution you get:

Solution-1: being 0.400 L=400 mL ⇒ 25 M* 0.400 L= 10 moles
Solution-2: being 0.300 L=300 mL ⇒ 30 M* 0.300 L= 9 moles

When mixing both solutions, it is obtained that the volume is the sum of both solutions:

Total volume= volume solution-1 + volume solution-2

and the number of total moles will be the sum of the moles of solution-1 and solution-2:

Total moles= moles of solution-1 + moles of solution-2

So the molarity of the final solution is:

$Molarity (M)= \frac{moles of solution 1 + moles of solution 2}{Volume solution 1 + Volume solution 2}$

In this case, you have:

moles of solution-1: 10 moles
moles of solution-2: 9 moles
volume solution-1: 0.400 L
volume solution-2: 0.300 L

Replacing:

$Molarity (M)=\frac{10 moles + 9 moles}{0.400 L + 0.300 L}$

Solving:

$Molarity (M)=\frac{19 moles}{0.700 L}$

Molarity= 27.14 $\frac{moles}{L}$

The molarity of the final solutions if these two solutions are mixed is 27.14 $\frac{moles}{L}$

4 0

3 years ago

In this experiment you used an excess of the BaCl2 solution. How would your results be affected if you did not use an excess of

Igoryamba

if we did not use an excess of the BaCl2 solution it would decrease the mass percentage of sulfate in the unknown sample.

The net precipitation equation would be.

Ba2+(aq) + SO42-(aq) → BaSO4(s)

If BaCl2 (Ba2+) is not taken in excess then the precipitation would not be completed as some of the sulfate ions would still be remaining in the solution. This would decrease the mass percentage of sulfate in the unknown sample.

If some tiny pieces of filter paper still remained mixed with the precipitate(BaSO4) then the mass of sulfate would increase and it gives a high mass percentage of the sulfate.

mass percentage of sulfate = (mass of sulfate/mass of sample)*100

Learn more about precipitation here brainly.com/question/14675507

#SPJ4

3 0

2 years ago

The basic structure of an amino acid contains the amine group, NH2, and a carboxylic acid group separated by one or more carbon

OLEGan [10]

The answer would be True

3 0

3 years ago