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alina1380 [7]
4 years ago
8

How much heat is needed to boil 45 grams of water at 100°C?​

Chemistry
1 answer:
wolverine [178]4 years ago
6 0

Answer:

Depends how much water and the temperature of the water. To heat 1 mL of water by 1 degree C 1 cal of energy (4.184 Joules) is required. Assuming that the water is at 25 degrees C, to boil one litre (liter) of water you would require 75,000 cal or 313.8 kJ.

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At a temperature of 274k, the gas in a cylinder has a volume of 4.0 liters. If the volume of the gas decrease to 2.0 liters, wha
irga5000 [103]

Answer:

The temperature will be 137 K for the gas pressure to remain constant

Explanation:

If the gas pressure keeps on constant, volume of the gas will be modified according to temperature.

V1 / T1 = V2 / T2

4L / 274K = 2L / T2

(4L / 274K) . T2  = 2L

T2 = 2L . (274K / 4L)

T2 = 137K

3 0
4 years ago
Weight of one mole of carbon = 12.01 g
dimulka [17.4K]
28.01 g/mol is the answer for carbon monoxide (CO)
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3 years ago
Read 2 more answers
Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C has decayed to 1/8.00 of the original amount.
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Take three half lives.

5730 x 3 = 17190
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4 years ago
5. A standardized mass was known to weigh exactly 5.0000g. It was weighed on a newly
sergey [27]

Answer:

Absolute error = 0.001

% Error = 002 5

Explanation:

The absolute error is the the difference in the measured value and the actual value of a quantity.

Here the actual value is 5.0000 grams

The measured value is 5.001 grams

Absolute error

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= \frac{0.001}{5.000} * 100\\

= 0.02 %

5 0
3 years ago
The reaction 2a + b --> c + d has an activation energy of 80.0 kj/mol. at 320°c, the rate constant k = 1.80 x 10-2 l mol-1 s-
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To determine the k for the second condition, we use the Arrhenius equation which relates the rates of reaction at different temperatures. We do as follows:

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ln 1.80x10^-2 / k2 = 80000 / 8.314 ( 1/723.15 - 1/593.15)

k2 = 0.3325 L / mol-s
5 0
4 years ago
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