All categories

3 years ago

This is due at 12am HELP!!

Chemistry

1 answer:

Lisa [10]3 years ago

4 0

Answer:

I have the same

Explanation:

like I have the same homework as you are u in my class lol?

You might be interested in

Please help I will give brainliest!!!

anyanavicka [17]

Need a picture for reference

7 0

3 years ago

A spacecraft is traveling at a speed of 2.3 km/sec. It takes 2.5 minutes to pass a small asteroid. how wide is the asteroid (i.e

lidiya [134]

Answer: The spacecraft traveled 345 km during the given time.

Explanation:

To calculate the distance of spacecraft, we use the equation:

$\text{Velocity}=\frac{\text{Distance}{\text{Time}}$

We are given:

Velocity = 2.3 km/sec

Time = 2.5 mins = 150 sec (Conversion factor: 1 min = 60 sec)

Putting values in above equation, we get:

$\text{Distance}=(2.3km/s\times 150s)=354km$

Hence, the spacecraft traveled 345 km during the given time.

4 0

3 years ago

You have a 25.0 L cylinder of helium at a pressure of 132 atm and a temperature of 19 [infinity]C. The He is used to fill balloo

Oduvanchick [21]

Answer: Number of balloons that can be filled with He are 1397.

Explanation:

The given data is as follows.

V = 25 L He , P = 131 atm

T = $19^{o}C$ = (19 + 273) K

= 292 K

According to ideal gas equation,

PV = nRT

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

= $\frac{131 \times 25}{0.082 \times 292}$

= 136.76 mol of He

The data for small balloons is given as follows.

T = $27^{o}C$ = (27 + 273) K

= 300 K

P = 732 = 0.963 atm

V = 2.50 L

Now, we will calculate the number of moles as follows.

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

= $\frac{0.963 \times 2.50}{0.082 \times 300}$

= 0.098 mol

So, number of balloons that can be filled with He are calculated as follows.

n = $\frac{N_{1}}{N_{2}}$

= $\frac{136.76}{0.098}$

= 1397.60 balloons

or, = 1397 balloons (approx)

Thus, we can conclude that number of balloons that can be filled with He are 1397.

7 0

3 years ago

Calculati volumul ocupat in conditii normale de temperatura si presiune de: a)14,2 kg Cl2; b)15,055×10²³ molecule Cl2 Va roggggg

Goshia [24]

Answer:

a) 4480L

b) 56L

Explanation:

To answer this question you need to know that Cl2 molecular weight is 71 g/mol and gas volume at NTP is 22.4 L/mol.

a) 14.2 kg of Cl2 in moles will be: 14.2 kg * (1000g/kg) / ( 71g/mol)= 200 mol

The volume of 200 mol of gas in NTP will be: 200 mol * 22.4L/mol= 4480L

b) every mol is made of 6.02 * 10²³ molecules. Then the volume of the gas will be: (15,055×10²³ molecule) / (6.02 * 10²³ molecules/mol) * 22.4 L/mol= 56L

3 0

4 years ago

If a 900.0-g sample of radium-226 decays to 225.0 g of radium-226 remaining in 3,200 years, what is the half-life of radium-226?

Rina8888 [55]

After 3200 years, the amount remaining of the original 900 g is 225/900 = 1/4.
Each half-life is enough time to reduce the amount of a radioactive material by a factor of 2.
1/4 is a reduction by two factors of 2. (1/2 * 1/2 = 1/4)
So 3200 years is two half-lives, so one half-life is 1600 years. Source(s):

3 0

3 years ago

Read 2 more answers