Using the diameter information from the table, which answer lists the planets in the correct order, from largest to smallest?

Where was the first permanent European settlement in what is now the United States?

siniylev [52]

Answer:

Jamestown, Virginia

Explanation:

6 0

2 years ago

How many grams of solid NaOH are required to prepare a 400ml of a 5N solution? show your work!

Nuetrik [128]

<u>Answer:</u> The mass of solid NaOH required is 80 g

<u>Explanation:</u>

Equivalent weight is calculated by dividing the molecular weight by n factor. The equation used is:

$\text{Equivalent weight}=\frac{\text{Molecular weight}}{n}$

where,

n = acidity for bases = 1 (For NaOH)

Molar mass of NaOH = 40 g/mol

Putting values in above equation, we get:

$\text{Equivalent weight}=\frac{40g/mol}{1eq/mol}=40g/eq$

Normality is defined as the umber of gram equivalents dissolved per liter of the solution.

Mathematically,

$\text{Normality of solution}=\frac{\text{Number of gram equivalents} \times 1000}{\text{Volume of solution (in mL)}}$

Or,

$\text{Normality of solution}=\frac{\text{Given mass}\times 1000}{\text{Equivalent mass}\times \text{Volume of solution (in mL)}}$ ......(1)

We are given:

Given mass of NaOH = ?

Equivalent mass of NaOH = 40 g/eq

Volume of solution = 400 mL

Normality of solution = 5 eq/L

Putting values in equation 1, we get:

$5eq/L=\frac{\text{Mass of NaOH}\times 1000}{40g/eq\times 400mL}\\\\\text{Mass of NaOH}=80g$

Hence, the mass of solid NaOH required is 80 g

4 0

3 years ago

A sample of marble has a volume of 6 cm and a density of 2.76 g/cm3. What is its mass?

Alexus [3.1K]

Answer:

16.56g

Explanation:

d=m/v

2.76=m/6

2.76*6=m

16.56=m

m=16.56g

3 0

3 years ago

A compound is analyzed and found to contain 22.10%Al, 25.40%P, and 52.50%O. What is the empirical formula of the compound?

Sindrei [870]

A compound is analyzed and found to contain 22.10%Al, 25.40%P, and 52.50%O

Let the total mass of compound = 100g

The mass of Aluminum = 22.10 g

Moles of Al = mass / atomic mass = 22.10 /23= 0.96

The mass of P = 25.40 g

Moles of P = 25.40 / 31 = 0.819

The mass of oxygen = 52.50 g

Moles of oxygen = 52.50 / 16= 3.28

The mole ratio of the two elements will be

Al = 0.96/0.819 = 1.17

P = 0.819/0.819 = 1

O = 3.28 / 0.819 = 4

The whole number ratio will be 1 : 1 : 4

So formula will be AlPO4

5 0

3 years ago

the density of gold is 19.3 g/cm3. a 3.4 mg piece of gold is hammered into a square that is 8.6 x 10-6 cm thick. what is the len

faltersainse [42]

Answer:

The length of a side of the square is 4.53 cm

Explanation:

Volume (V) = mass/density

mass = 3.4 mg = 3.4/1000 = 0.0034 g

density = 19.3 g/cm^3

V = 0.0034/19.3 = 1.76×10^-4 cm^3

Volume = area × thickness

Area = volume/thickness = 1.76×10^-4/8.6×10^-6 = 20.48 cm^2

Length of one side of the square = sqrt(area of square) = sqrt(20.48 cm^2) = 4.53 cm

3 0

3 years ago