6. Calculate the molarity if 35.0 grams of KBr are dissolved in 700. ml?

Chemistry

2 answers:

olga55 [171]2 years ago

8 0

Answer:

To calculate molarity, divide the number of moles of solute by the volume of the solution in liters. If you don't know the number of moles of solute but you know the mass, start by finding the molar mass of the solute, which is equal to all of the molar masses of each element in the solution added together.

Explanation:

try starting with 35.0 and dived it by the volume

neonofarm [45]2 years ago

3 0

Answer:

About 0.4143M

I gave you extra numbers after the decimal point in case you have to round higher.

Explanation:

Molarity is the Moles per liter ratio so we need to find how many moles of KBr are in 35 grams which is about 0.29 moles.

So no (0.29)/(0.7)=0.4143

The 0.7 is from 700ml is 0.7 Liters.

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If you know the mass of Earth, what other single value would you need to know to calculate Earth's average density?

Dennis_Churaev [7]

Answer:

Volume

Explanation:

Density:

Density is equal to the mass of substance divided by its volume. In order to find the density of earth when mass is given we have to calculate its volume. The volume of earth is calculated by using the volume formula for sphere. i.e 4/3 π r³. we also require radius to find the volume and we know that

Diameter = 2 × radius

The diameter of earth equator is 12756.75 Km. So we calculate the radius by dividing the diameter by 2. Then by putting the value of radius in 4/3 π r³ we will get the volume and then we can calculate the density of earth.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

7 0