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3 years ago

What is the mass number of an ion with 108 electrons, 157 neutrons, and a 1 charge?

1 answer:

3 0

The answer is 264.12

The element is Bh (Bohrium). If the ion has a 1 charge, the charge can either be 1+ or 1-. So the ion has to be an element with the atomic number 107 or 109 (Bh or Mt). Using simple math, subtract the atomic number from the mass number to equal 157.

264 - 107 = 157

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Find the density of an object that has a mass of 5 kg and a<br> volume of 50 cm3.

iren2701 [21]

Mass=5kg=5000g
Volume=50cm^3

$\\ \rm\longmapsto Density=\dfrac{Mass}{Volume}$

$\\ \rm\longmapsto Density=\dfrac{5000}{50}$

$\\ \rm\longmapsto Density=100g/cm^3$

4 0

3 years ago

HELP PLEASE!! 20 POINTSS

Mrac [35]

The answer is 110., but round accordingly

3 0

3 years ago

List three harmful effects of excessive nitrates in the environment

jek_recluse [69]

Answer:

higher costs, energy use and carbon emissions

Explanation:

not sure if this is right or not, I apologize if this is wrong

3 0

3 years ago

saras car is advertised to get 43 miles per gallon. Sara calculated her gas mileage over the pass month to 39 miles per gallon w

swat32

Answer:

Sara's percentage yield of gas mileage is approximately 90.7%

Explanation:

Percentage yield of an process is given by the ratio of the observed, experienced (calculated), or actual yield to the theoretical yield of the process and then multiplying the result by 100%

$Percentage \ yield = \dfrac{Actual \ yield}{Theoretical \ yield} \times 100$

The theoretical yield of Sara's car is the mileage advertised for the car which the car has 'ideally' which is 43 miles per gallon

∴ The theoretical yield = 43 miles/gallon

The actual yield is the yield of the car Sara is able to calculate, based on how she uses the car which is 39 miles per gallon

∴ The actual yield = 39 miles/gallon

Sara's percentage yield of gas mileage for the car, % yield, therefore is given as follows;

% yield = (39 miles/gallon)/(43 miles/gallon) × 100 ≈ 90.7%

Sara's percentage yield of gas mileage, % yield ≈ 90.7%.

8 0

3 years ago

LiOH + KCI → LiCl + KOH

yulyashka [42]

Answer:

35.42g

Explanation:

LiOH + KCI → LiCl + KOH

Let us determine the molar mass of LiOH and LiCl. This is illustrated below:

Molar Mass of LiOH = 7 + 16 + 1 = 24g/mol

Molar Mass of LiCl = 7 + 35.5 = 42.5g/mol.

Now, we can obtain the theoretical yield of LiCl as follow:

From the equation above,

24g of LiOH reacted to produce 42.5g of LiCl.

Therefore, 20g of LiOH will react to produce = (20 x 42.5)/24 = 35.42g of LiCl.

From the above calculations, the theoretical yield of LiCl is 35.42g

3 0

4 years ago