Answer: the correct answer is a.
Explanation: a spreading of the sea floor is the correct answer.
Answer:
Here's what I get
Explanation:
When a solid is converted to a liquid, heat is absorbed. TRUE.
Temperature remains constant while all of a solid is converted to a liquid. TRUE.
When heat is applied to a solid, the molecular motion decreases as the temperature increases. False. Molecular motion increases as the temperature increases.
The average kinetic energy of the system changes while all of a solid is converted to a liquid. False. The temperature remains constant during a phase change, so the average kinetic energy of the system does not change.
The temperature increases while all of a liquid is converted to a gas. False.
Hi!
To convert grams to moles, you need to divide the amount (grams) of your substance by its molar mass, both of which are given to you.
28 g CaO / 58.08 g/mol CaO = 0.4820936639 moles of CaO
(And 28 contains two significant digits, so you will round this to 0.48 moles.)
Good luck!
Answer:
Explanation:
Given that:
Mass of 
, m = 45.0 g
Molar mass of , M = 30.01 g/mol
Temperature = 20.0 °C
The conversion of T( °C) to T(K) is shown below:
T(K) = T( °C) + 273.15
So,
T₁ = (20.0 + 273.15) K = 293.15 K
V = ?
Pressure = 740 mm Hg
Considering,
Using ideal gas equation as:
where,
P is the pressure
V is the volume
m is the mass of the gas
M is the molar mass of the gas
T is the temperature
R is Gas constant having value = 62.36367 L. mmHg/K. mol
Applying the values in the above equation as:-
Haha ironically I had this problem not too long ago, I hope by this we will both be better students. Everyone just needs practice. Ok stop to pep talk and lets go. I'll try to go step by step.
<span>So basically since this is a balanced equation, the ratios of mols of the elements are equal, atom wise. </span>
<span>So you notice they give you Br2 is 1.0 kg (1000g) and that means there are 2 mols of Br2. And its asking for Cl2, (on the left) it also has 2 mols. </span>
<span>Then you can start from 1000g Br2 and multiply with 2 mol Br2 and 159.8g Br2 on the bottom. The 159 8 is the actual grams per mol. Then when you write this down, continue multipying with the next fraction. </span>
<span>Since you know the molar mass of Cl2 is 70.4 and you know theres 2 mols, you can say that 2 mols of Br2 = 2 mols of Cl2 so you should be able to multiple 2 mol Br2 / 159.8g Br2 with 70.4 g Cl2 / 2 mol Cl2. Bam the mols cancel out and you have the grams for Cl2. Multiple all that out and you should get 443g Cl2. Notice how the beginning question gives 2 significant figures, so technically 440g Cl2 is more of an exact number.</span>
