How many miles is 1125.90 feet ?

The table below gives the atomic mass and relative abundance values for the three isotopes of element M.

Serhud [2]

The average atomic mass formula is:

$average atomic mass = \Sigma (percent abundane)\times (atomic mass)$

Substituting the values in the formula:

$average atomic mass = \frac{78.99\times 23.9850+10\times 24.9858+11.01\times 25.9826}{100}$

$average atomic mass = \frac{1894.57515+249.858+286.068426}{100}$

$average atomic mass = 24.30516 amu$

Hence, $24.30516 amu$ is the average atomic mass of element M.

7 0

3 years ago

What does NO5 stand for?

nekit [7.7K]

1- Nitrogen 5- Oxygen maybe, i can't find it on the periodic table

3 0

3 years ago

When the pressure that a gas exerts on a sealed container changes from 22.5 psi to psi the temperature changes from 110 c to 65.

ad-work [718]

Gay- Lussacs law states that the pressure of a gas is directly proportional to temperature for a fixed amount of gas at constant volume.
therefore P/T = k
where P - pressure , T - temperature and k - constant
$\frac{P1}{T1} = \frac{P2}{T2}
$
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 - temperature in kelvin - 110 °C + 273 = 383 K
T2 - 65.0 °C + 273 = 338 K
substituting these values in the equation

$\frac{22.5 psi}{383 K} = \frac{P}{338K}$
P = 19.9 psi
new pressure is 19.9 psi

3 0

3 years ago

If your unknow solid has an impurity that is insoluble in cyclohexane, will this impurity result in the molar mass of the unknow

ser-zykov [4K]

Answer:

High

Explanation:

When the unknown compound contains an impurity that is insoluble in cyclohexane, the solute will not dissolve in the solvent (cyclohexane) completely. ∆T of the solution would be smaller than it is supposed to be, when compared to a compound without such insoluble impurity. Molecular weight determination won't be accurate because the molecular weight obtained will be higher as a result of the fact that the mass of the solute would include the actual solute that is changing the temperature and the excess mass of the impurity.

5 0

3 years ago

An unknown amount of sodium azide (NaN3) reacts and produces 0.033 moles of nitrogen gas. What mass of sodium metal is produced

Monica [59]

Answer:

Mass of sodium metal is 130.87 gram

Explanation:

The complete reaction is

2 NaN3 --> 2 Na + 3 N2

We know that PV = nRT

n = $\frac{PV}{RT}$

On substituting the given values, we get

$n = \frac{\frac{99707}{101325}*75 }{0.082 *(273.15 +15)} \\n = 3.02$ moles of N2

Sodium azide's molar mass

3.02 *(2/3) = 2.013 moles

Mass = 2.03 * 65.01 = 130.87 gram

3 0

3 years ago