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Luden [163]
3 years ago
13

PLS HELP ME I HAVE TILL 12

Chemistry
1 answer:
MariettaO [177]3 years ago
3 0

Answer:

alright bud lets see hmm.... the answer is a. 90.5kpa

Explanation:

92.3 kPa - 1.82 kPa = 90.5 kPa

keep up your hope also corrected me if a am wrong in anyway! :)

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If the absolute temperature of a gas is tripled, what happens to the root‑mean‑square speed of the molecules?
Gnesinka [82]

Answer:

D. The new rms speed is 1.732 times the original rms speed.

Explanation:

The expression for the root mean square speed is:

C_{rms}=\sqrt {\dfrac {3RT}{M}}

R is Gas constant having value = 8.314 J / K mol  

M is the molar mass of gas

T is the absolute temperature

As seen from the formula, root mean square speed is directly proportional to the square root of the absolute temperature.

So,

C_{rms}\propto \sqrt {T}

Given, absolute temperature of a gas is tripled, so, the new rms speed will be √3 (1.732) of the original.

<u>Hence, the correct option is:- D. The new rms speed is 1.732 times the original rms speed.</u>

4 0
3 years ago
A student performed an analysis of a sample for its calcium content and obtained the following results:
sweet-ann [11.9K]

Answer:

14.9075 g, 28.67%, 0.11%

Explanation:

The mean concentration of calcium = summation x / frequency

= ( 14.92 + 1491 + 14.88 + 14.92 ) /4 = 14.9075 g

Standard deviation = √(summation (x - μ)² /n) = √ ( ((14.92 - 14.9075)² +(14.91 - 14.9075)² + (14.88 - 14.9075)² + ( 14.92 - 14.9075)²) / 4) = 0.0164

b)  percent error = abs(14.9075 - 20.90) / 20.90 × 100 = 28.67%

c) relative standard deviation = standard deviation / mean × 100 = 0.0164 /  14.9075 × 100 = 0.11%

d) The accuracy of the measure is the measurement compared to the actual which according to the standard set by the instructor (5%error) is not very accurate because the percent error is high (28.67%) while the relative standard deviation is quite low ( 0.11%) which means the measurement precision is very high.

The student will have to redo the experiment because the experiment was not too accurate since the percent error is way higher than the set value (5%) although the precision was high.

5 0
3 years ago
The shedding of icebergs from a glacier is known as
lapo4ka [179]
The answer is calving

hope that helped
6 0
2 years ago
Read 2 more answers
N2 + 2H2 --&gt; N2H4
mel-nik [20]

Answer:

1. 12.18g of N2H4.

2. 62.24g of N2H4

3. 87.23g of N2

Explanation:

N2 + 2H2 —> N2H4

Molar Mass of N2 = 2x14 =28g/mol

Molar Mass of N2H4 = (2x14) + (1x4) = 28 + 4 = 32g/mol

Molar Mass of H2 = 2x1 = 2g /mol

Mass conc of H2 from the balanced equation = 2 x 2 = 4g

1. From the balanced equation,

28g of N2 produced 32g N2H4.

Therefore, 10.66 g of N2 will produce = (10.66x32)/28 = 12.18g of N2H4.

2. From the balanced equation,

4g of H2 produced 32g of N2H4.

Therefore, 7.78 g of H2 will produce = (7.78x32)/4 = 62.24g of N2H4

3. From the balanced equation,

28g of N2 produced 32g N2H4.

Therefore, Xg of N2 will produce 99.69 g of N2H4 i.e

Xg of N2 = (28x99.69)/32 = 87.23g

7 0
3 years ago
How Do You Get Different Coloured Fireworks? ​
shtirl [24]

Explanation:

Different coloured fireworks can be achieved through the chemistry bond of reaction between substances and methyl orange or other as indicator and promoter too.

4 0
2 years ago
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