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ch4aika [34]
4 years ago
8

What does the word contribution mean?

Chemistry
1 answer:
lora16 [44]4 years ago
4 0
<span>a gift or payment to a common fund or collection.</span>
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What volume of 2.0 NaOH is required to neutralize 25.0 ml of 2.70 N H2SO4?<br>​
Viktor [21]

Write the equation for the reaction and balance it. In this case the equation is: 2NaOH + H2SO4 → Na2SO4 + 2H2O

Convert the given amount to moles. Molarity, “M” is moles per liter. The given amount is 25 ml of 1.2 M H2SO4. Since Molarity uses Liters, the volume must be converted from ml to L.

Use the mole ratio in this case 2 moles of NaOH to ! mole of H2SO4

Convert the moles to the required units. In this case the required units are grams. The formula weight in grams er mole.

25 ml H2SO4 * 1L/1000 ml * 1.2 Moles/L * 2 moles NaOH/1 mole H2SO4 * 40 g NaOH/ 1 Mole NaOH

Perform these calculations and you have the answer! Timothy, When doing homework, the answer is NOT the important thing, the METHOD is! These 4 steps, combined with required changes in units will sove ANY stoichiometric problem easily.

6 0
3 years ago
Find the molality of this aqueous solution 15.0% by mass kBr (119g/mol).
Vsevolod [243]

Answer:

we will take a 100g sample of this solution for our convenience

so , there is 15 g kBr in this 100g solution

we know that molality is the number if moles of solute / mass of solvent in kg

we need to find the number of moles in 15g kBr

no of moles = 15/119 s

moles  = 0.126 moles/ 100g

multiplying both the numerator and the denominator by 10 to get 1 kg in denominator

=  1.26 moles / 1 kg

Hence, the molality is 1.26

would appreciate a brainliest

3 0
4 years ago
What is the basic building block of a nucleic acids?
Leya [2.2K]
Phosphate group , pentose sugar , nitrogen base nucleotide
7 0
4 years ago
I need help, lots of points to you, please give genuine answers, will mark brainliest.​
PSYCHO15rus [73]

Answer:

this is hard

Explanation:

3 0
3 years ago
When water is heated in an ocean the liquid water changes from and turns into?
sasho [114]
Hello!

The answer is Evaporation

When you add heat to water, it boils, releasing gas into the air. This is called Evaporation. The water changes from a liquid to a gas.

Hope this helped!
6 0
3 years ago
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