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Dima020 [189]
3 years ago
10

What is the density of aluminum in pounds per cubic inch?

Chemistry
1 answer:
ASHA 777 [7]3 years ago
6 0

Answer:

0.098 pounds per cubic inch

Explanation:

The density of aluminum is 2.7 grams per cubic centimeter (2.7g/cm^3)

2.7g/cm^3 × 1lb/453.59g × (2.54cm)^3/(1in)^3 = 0.098lb/in^3

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A sample of gas (1.9 mol) is in a flask at 21 °C and 697 mmHg. The flask is opened and more gas is added to the flask. The new p
mariarad [96]

Answer:

The new moles of the gas in the flask is 2.13 moles.

Explanation:

Given;

number of moles of gas, n = 1.9 mol

temperature of the gas, T = 21 °C  = 21 + 273 = 294 K

pressure of gas, P = 697 mmHg

volume of gas, V = ?

Apply ideal gas law;

PV = nRT

Where;

R is gas constant, = 62.363 mmHg.L / mol. K

V = nRT / P

V = (1.9 x 62.363 x 294) / 697

V = 49.98 L

New pressure of the gas, P = 795 mmHg

New temperature of the gas, T = 26 °C = 273 + 26 = 299 K

New moles of the gas, n = ?

Volume of the gas is constant because volume of the flask is the same when more gas was added.

n = PV / RT

n = (795 x 49.98) / (62.363 x 299)

n = 2.13 moles

Therefore, the new moles of the gas in the flask is 2.13 moles.

4 0
3 years ago
How many atoms of nitrogen are in 10g of NH4NO3
lord [1]
There are 1.50 x10^6 atoms of nitrogen in 10 grams of NH4NO3. You convert the grams to moles first and then using the definition of a mole you determine the number of molecules.
5 0
3 years ago
A newspaper story describing the local celebration of Mole Day on October 23 (selected for Avogadro's number, 6.02 X 10^ 23 ) at
stepladder [879]

Answer:

The answer is "670.176 km".

Explanation:

Volume of the occupies of one  M & M= 0.5 \ cm^3\\\\

M&M 1 mole= 6.02 \times 10^{23}\\\\

Calculating volume of M& M mole=  0.5 \ cm^3 \times 6.02 \times 10^{23}=3.01 \times 10^{23}\ cm^3\\\\

Calculating the cube moleL^3= 3.01 \times 10^{23}\ cm^3\\\\

L=6.70176 \times 10^{7}\ cm\\\\

   =6.70176 \times 10^{7}\ cm \times \frac{1\ m}{100\ cm}\\\\=670176\ m\\\\=670.176 \ km

Therefore 18 tractor trailers wouldn't be sufficient.

8 0
3 years ago
If I have a 78c and I fail a test that’s worth 15% of my grade what would it drop to ?
koban [17]
Depends on the grade of the test. But for the most part if it’s below a 78, it’ll drop, If it’s above it’ll raise. It shouldn’t drop or raise it more than 3 point/percent.
8 0
2 years ago
4.1.2 Quiz: What is scientific notation?
Eddi Din [679]

Answer:

D. Scientific notation is a way of writing large and small numbers

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3 years ago
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