Which word best describes a mixture that is 85 percent copper and 15 percent tin?

What is the wavelength of the matter wave associated with an electron (me= 9.1 x 10-31 kg) moving with a speed of 2.5 x 107 m/s?

riadik2000 [5.3K]

And h value is constant 6.624 x 10^-34

3 0

3 years ago

Franklin Roosevelt promised the American people a "new deal," a pledge he made actually before he was elected, at the Democratic

Minchanka [31]

The New Deal program was to help the American economy recover from the Great Depression.

<h3>Who was Franklin Roosevelt?</h3>

Franklin Delano Roosevelt was an American politician and attorney who served as the 32nd president of the United States from 1933 until his death in 1945.

Roosevelt promised the American people a "New Deal" if he was elected president in 1932. The goal of this New Deal program was to help the American economy to recover from the Great Depression.

Roosevelt's deal was based on providing economic relief to citizens, reforming institutions that failed during the early 1930's, and helping the overall economy to recover. This popular program lead FDR to be elected president 4 times.

Learn more about Franklin Roosevelt here:

brainly.com/question/8333337

#SPJ1

4 0

2 years ago

HELPPP PLS

photoshop1234 [79]

I think it could be C maybeee though

6 0

3 years ago

The bacteria can chemically combine nitrogen with hydrogen to form ammonia (NH3). This combining process is called nitrogen fixa

nikklg [1K]

Answer:

bacteria

Explanation:

they are decomposers. they decompose dead material by fixing nitrogen

7 0

3 years ago

A gaseous compound is 30.4 % N and 69.6% OF. A 5.25 g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 958

Harman [31]

Answer:

The molecular formula = N2O4

Explanation:

Step 1: Data given

A gaseous compound is 30.4 % N and 69.6%

Mass of the compound = 5.25 grams

Volume of the gas = 1.00 L

Pressure of the gas = 958 mmHg = 1.26 atm

Temperature of the gas = -4 °C = 273 -4°C = 269 Kelvin

Molar mass of N = 14 g/mol

Molar mass of O = 16 g/mol

Step 2: Calculate mass of N

Mass of Nitrogen = 5.25 grams * 0.304 = 1.596 grams

Step 3: Calculate mass of O

Mass of Oxygen = 5.25 grams * 0.696 = 3.654 grams

Step 4: Calculate number of moles N

Number of moles N = Mass of N/ Molar mass of N

Moles of N = 1.596 grams / 14g/mol

Moles of N = 0.114 moles N

Step 5: Calculate moles of O

Moles O = 3.654 grams / 16 g/mol

Moles 0 = 0.2884 moles

Step 6: Calculate empirical formule

We calculate the empirical formule by dividing number of moles by the smallest number of mol

N : 0.114 / 0.114 = 1

O: 0.2284 / 0.114 = 2

Empirical formule = NO2

Step 7: Calculate number of moles of 5.25 g sample via gas law:

p*V = nRT

⇒ with p = the pressure = 1.26 atm

⇒ with v = 1.00 L

⇒ with n = the number of moles = TO BE DETERMINED

⇒ with R = the gas constant = 0.08206 L*atm/ K*mol

⇒ with T = the temperature = 269 K

number of moles n = (p*V)/(R*T)

n = (1.26*1L)/(0.08206*269)

n = 0.057 mol

Step 8: Calculate molar mass of the compound

This means 5.25 grams of the gas = 0.057 moles

So 1 mol of the compound has a molar mass of: 5.25 / 0.057 = 92.11 g/mol

Step 9: Calculate molar mass of the empirical formula NO2

N = 14 g/mol

O = 16 g/mol

NO2 = 14 + 16 + 16 = 46 g/mol

The empirical formule NO2 has a molar mass of 46 g/mol

Step 10: Calculate molecular formula

92.11 / 46 = 2

This means the empirical formula should be multiplied by 2

2*(NO2) = N2O4

The molecular formula = N2O4

8 0

3 years ago