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Mrac [35]
3 years ago
8

Calcium carbide reacts with water to produce acetylene gas according to the following equation: CaC2(s) + 2H2O(l)C2H2(g) + Ca(OH

)2(aq) The product gas, C2H2, is collected over water at a temperature of 25 °C and a pressure of 759 mm Hg. If the wet C2H2 gas formed occupies a volume of 8.19 L, the number of moles of CaC2 reacted was ______ mol. The vapor pressure of water is 23.8 mm Hg at 25 °C.
Chemistry
1 answer:
poizon [28]3 years ago
7 0

Answer:

33.7

Explanation:

i just know i had a question on it'

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Viefleur [7K]
Boiling point
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6 0
4 years ago
What is the molarity of solution prepared by dissolving 11.75 g of KNO3 in enough water to produce 2.00 L of solution?
zysi [14]
The molar mass of the compound potassium nitrate, KNO3 is equal to 101.1032 g/mol. Then, we determine the number of moles present in the given amount,
                       n = 11.75g / (101.1032 g/mol) = 0.116 mol
Then, molarity is calculated by dividing the number of moles by the volume of the solution. The answer is therefore 0.058 M. 
3 0
3 years ago
A scientist digs up sample of arctic ice that is 458,000 years old. He takes it to his lab and finds that it contains 1.675 gram
Fiesta28 [93]

Answer:

6.70 grams of krypton-81 was present when the ice first formed

Explanation:

Let use the below formula to find the amount of sample

N= N_0(\frac{1}{2})^n

where

n = \frac{t}{t_{\frac{1}{2}}}

here

t =  458,000 years

t_{\frac{1}{2}} = 229,000

\frac{t}{t_{\frac{1}{2}}} = \\frac{ 458,000}{229,000}

n = \frac{t}{t_{\frac{1}{2}}} = 2.000

Now substituting the values

1.675 = N_0(\frac{1}{2})^{2.000}}

1.675 = N_0\times (0.2500)

N_0= \frac{1.675}{0.2500}

N_0=6.70

3 0
3 years ago
How many moles are in 20.50 grams of NH3?
Tema [17]
Sorry, the correct answer is A. 3.4 x 10 - 24

Hope I helped ; )
6 0
3 years ago
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What is the atomic mass of neon to the nearest tenth<br><br><br>help me pls
motikmotik

Answer:

20.2

Explanation:

6 0
3 years ago
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