A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.

Answers

Answer 1

Answer: The freezing point constant means that the temperature depression when adding one mole of the solute. The mole number of the solute is 10.20/180=0.0567 mol. So the answer is 1.86*0.0567=0.105 ℃.

Answer 2

Answer:

10.20 g C6H12O6 x (1 mole C6H12O6 / 180 g C6H12O6) = 0.0567 mole C6H12O6

Then convert grams of water to kilograms of water by dividing by 1000.

355 g / 1000 = .355 Kg of H2O

molality (m) = (0.0567 mole C6H12O6 / .355 Kg of H2O) = 0.160 m

Then plug it in to the formula Δtf = Kfm

Δtf = (-1.86 °C/m) x (0.160 m)

Δtf = -0.298 °C

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Which of the following reactions produce oxygen gas? Anaerobic respiration

Photosynthesis

Aerobic respiration

Fermentation

Answers

The correct answer is photosynthesis. Photosynthesis is the process in plants to make their food. This involves the use carbon dioxide to react with water and make sugar or glucose as the main product and oxygen as a by-product.

What is the [H+] of an HCl solution if the pH is measured to be 6? Select one: a. 1 X 10-7 M b. 1 X 10-6 M c. 6 X 10-6 M d. 8 X 10-1 M

Answers

Answer : The correct option is, $1* 10^(-6)M$

Explanation : Given,

The value of pH of HCl = 6

As we know that,

pH : It is defined as the negative logarithm of hydrogen ion or hydronium ion concentration.

The formula of pH is :

$pH=-\log [H^+]$

Now put all the given values in this formula, we get the concentration of hydrogen ion.

$6=-\log [H^+]$

$[H^+]=1* 10^(-6)M$

Therefore, the concentration of hydrogen ion is, $1* 10^(-6)M$

$pH=-\log_(10) [H^+] \Rightarrow [H^+]=10^(-pH) \n \npH=6 \n\ [H^+]=10^(-6)=1 * 10^(-6)$

The answer is B. 1 × 10⁻⁶ M.

Why are plant cells and animal cells diffrent?

Answers

because plants don't eat meat

Which planet do scientists believe prevented the asteroids in the asteroids belt from forming a planet? A. Earth
B. Jupiter
C. Mars
D. Neptune

Answers

I think it is Jupiter. Let me know if I am right, I hope I am.

Answer: Jupiter is believed to have prevented the asteroids in the asteroid belt from forming a planet.

A 1. 00 L volume of HCl reacted completely with 2. 00 L of 1. 50 M Ca(OH)2 according to the balanced chemical equation below. 2HCl Ca(OH)2 Right arrow. CaCl2 2H2O What was the molarity of the HCl solution? 0. 375 M 1. 50 M 3. 00 M 6. 00 M.

Answers

Answer:

The first step is to find the number of moles of OH⁻ that reacted with the HCl. To do this multiply 2.00L by 1.50M to get 3 moles of Ca(OH)₂. Then you multiply 3 by 2 (there are 2 moles of OH⁻ per every 1 mole of Ca(OH)₂) to get 6 moles of OH⁻. That means that you needed 6 moles of HCl since 1 mole of HCl contains 1 mole of H⁺ and equal amounts H⁺ and OH⁻ reacted with each other. To find the molarity of the HCl solution you need to divide 6mol by 1L to get 6M. Tat means that the concentration of the acid was 6M.

I hope this helps. Let me know if anything was unclear.

Explanation:

A sample of hydrogen gas, has a volume of 8.56 L at a temperature 0oC and pressure of 1.5 atm. Calculate the number of moles of hydrogen present in this gas sample ( Assume that the gas behave ideally)

Answers

According to ideal gas law, there are 0.00565 number of moles of hydrogen present in the gas sample .

What is ideal gas law?

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.Ideal gas law was proposed by Benoit Paul Emile Clapeyron in year 1834.It is a thermodynamic equation which has wide applications.

Gases which obey ideal gas law are difficult to exist.

Substituting the values as, P=1.5 atmospheres, V=8.56 L, R=8.314 ,T=0°C=273 K that is , n=PV/RT=1.5×8.56/8.314×273=0.00565 moles.

Thus, there are 0.00565 moles of hydrogen present in the gas sample .

Learn more about ideal gas law,here:

brainly.com/question/28257995

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p = 1.5atm ≈ 1519.88hPa
V = 8.56L
R = 83.1 [hPa*L] / [mol*K]
T = 0°C =273K

pV = nRT |:RT

n = pV / RT

n = [1519.88hPa*8.56L] / [83.1 [hPa*L] / [mol*K] * 273K]
n ≈ 0.57mol

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