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Black_prince [1.1K]
2 years ago
5

The beginning expansion of the big bang happened relatively slowly compared to how it is expanding now.

Chemistry
1 answer:
Sav [38]2 years ago
5 0
A. True_________________
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In the reaction n2 + 3h2 ---> 2nh3, how many grams of nh3 are produced if 25.0 g n2 reacts with excess h2? question 10 option
Lisa [10]
Molar mass of N2 = 28

Moles of N2 = 25 / 28 = 0.89

So, moles of NH3 produce = 2 x 0.89 = 1.78 

Note: H2 is in excess. so no need to care about it. 
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PLEASE HELP! ILL GIVE BRAINLIEST, EXPLAIN YOUR ANSWER PLS
Pavel [41]

Answer:

arteries carry blood from the heart to the lungs and veins carry blood from the lungs to the heart

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Arteries carry oxygenated blood from the heart, while veins carry oxygen-depleted blood back to the heart. ... The pulmonary veins transport oxygenated blood back to the heart from the lungs, while the pulmonary arteries move deoxygenated blood from the heart to the lungs.)

4 0
2 years ago
Calculate the molarity of a solution consisting of 25.0 g of KOH in 3.00 L of solution.
melomori [17]

Answer:

0.15M

Explanation:

The equation for molarity is M= n/L. Where "M" is Molarity, "n" is the number of moles of solute, and "L" is the total liters in solution.

You need to calculate the number of moles from the given grams. The molar mass of KOH is (39.098+ 16 +1.008)= 56.106g. To calculate the mols of KOH, \frac{25.0g}{1} × \frac{1 mol}{56.106g} = 0.44558... mol, you see that the grams unit cancel out leaving you with mol as the unit.

The volume is given in L already so no need to do any conversion. M= \frac{0.4558mol}{3.00L} = 0.1485M ≈ 0.15M

5 0
2 years ago
How many moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas?
ASHA 777 [7]
How many moles of water at produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas the answer is D
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