All categories

3 years ago

Will mark brainliest!

Chemistry

1 answer:

KatRina [158]3 years ago

6 0

Answer:

b. 1.20x10^24 molecules NH3

Explanation:

At STP, one mole of gas has a volume of 22.4 dm^3

1 dm^3 = 1 L

Therefore,

44.8 L = 44.8 dm^3

This means that there are 2 moles of NH3 in 44.8 L at STP.

number of molecules = number of moles times avogadro's number

Avogadro's number = 6.02x10^23

Numner of molecules = 2 x 6.02x10^23

= 1.204x10^23 molecules

You might be interested in

Please help me i’m in need!

makkiz [27]

Answer:

balanced............

3 0

2 years ago

I need chemistry help text me at (951) 897-8325 PLEASE

user100 [1]

Just post the question on here

7 0

2 years ago

Write word equation for reaction between sodium and sulphur

White raven [17]

Answer:

2Na + S —> Na2S

Hope this helps.

4 0

3 years ago

The half life of an isotope X is 3 days how long will it take for 1/2 of a 10 G sample to decay

lorasvet [3.4K]

Answer: It will take 3 days for half of a 10 g sample to decay.

Explanation:

Half-life of sample of an isotope X = 3 days

$\lambda=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{3 days}=0.231 day^{-1}$

$N=N_o\times e^{-\lambda t}$

$\lnN=-\lambda t\lnN_o$

Sample decayed = $\frac{N_o}{2}=\frac{10 g}{2 g}=5 g$

N= $N^o-\text{sample decayed}=10 g-5 g=5 g$ , time = t

$\ln[5 g]=-0.231 day^{-1}\times t\ln[10]$

$\ln[\frac{5}{10}]=-0.231\times t$

$\ln\frac{1}{2}=-0.693=-0.231\times t$

t = 3 days

It will take 3 days for half of a 10 g sample to decay.

3 0

2 years ago

Two workers used a force of 100 N to move a sofa 4 meters in 2 seconds how much power

r-ruslan [8.4K]

Answer:

200 watts

Explanation:

First we have to find total work:

W =F(d)

W = 400J

Then plug that answer into the Power formula.

P = W/(t_f-t-i)

P = 400/2s

P = 200 W

3 0

3 years ago