A lab technician needs to create 570.0 milliliters of a 2.00 M solution of magnesium chloride (MgCl2). To make this solution, how many grams of magnesium chloride does the technician need?Refer to the periodic table for help. Express your answer to three significant figures.

The required mass is grams.

Answers

Answer 1

Answer:

This question needs to use the molarity equation, $M=(n)/(V)$ , where M is molarity, n is number of moles and V is the volume. With this equation we can find the number of moles. The volume of 570ml should be converted to L for correct units.

$n=MV= (2mol)/(L)* 570ml * (L)/(1000ml)= 1.14mol$

Multiply the number of moles by the molecular mass of $MgCl_2$ which is 95.21 g/mol to get the mass.

$1.14 mol Mg(Cl_2) *(95.21 g)/(mol) = 108 g$ .

Answer 2

Answer:

109 for brainly just did it 5/5 correct (Three significant figures)

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1. If you have a 1-g sample of Po-218, how many grams would youhave after 6 minutes? After 18 minutes?

Answers

Answer:

a) 0.25 g b) 0.01542 g

Explanation:

Half life of Po-218 = 3.04 minutes

initial mass = 1 g

after 3.04 minutes it will remain 0.5 g

after another 3.04 minutes it will remain 0.25 g

After 6 minutes it will remain approx 0.25 g

B) after another 3.04 minutes it will remain 0.125 g

after another 3.04 minutes it will remain 0.0625 g

after another 3.04 minutes it will remain 0.03125 g

after another 3.04 minutes it will remain 0.015625 g

After 18 minutes it will remain approx 0.01542 g

What type of solid has the highest melting point? A. ionic solid
B. network solid
C. metal
D. nonmetallic solid

Answers

Answer:

The correct answer option is B. network solid.

Explanation:

A network solid has the highest melting point.

The reason being that all of the atoms in this type of solid are covalently bonded to one another so the covalent bonds must be broken throughout the substance.

These covalent bonds holding the solid together are stronger than the ionic bonds. So it means that more heat energy is needed to break these bonds and therefore a higher temperature is required for it.

Final answer:

Network solids have the highest melting point.

Explanation:

What type of solid has the highest melting point?

The correct answer is B. network solid. Network solids, also known as covalent network solids, have the highest melting points among the options listed. These solids are held together by a three-dimensional network of covalent bonds, which require a significant amount of energy to break and hence have high melting points.

For example, a diamond is a network solid consisting of carbon atoms bonded together in a strong network of covalent bonds. It has an extremely high melting point of around 3,500°C.