3 years ago

I have no idea what I'm doing in chemistry please help.

Chemistry

1 answer:

Tresset [83]3 years ago

5 0

Your just answering the questions..? lol

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Calculate the pH of a buffer solution prepared by dissolving 0.20 mole of cyanic acid (HCNO) and 0.80 mole of sodium cyanate (Na

Afina-wow [57]

The pH of a buffer solution : 4.3

<h3>Further explanation</h3>

Given

0.2 mole HCNO

0.8 mole NaCNO

1 L solution

Required

pH buffer

Solution

Acid buffer solutions consist of weak acids HCNO and their salts NaCNO.

$\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}$

valence according to the amount of salt anion

Input the value :

$\tt \displaystyle [H^+]=2.10^{-4}\times\frac{0.2}{0.8\times 1}\\\\(H^+]=5\times 10^{-5}\\\\pH=5-log~5\\\\pH=4.3$

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3 years ago

Solid sodium reacts with liquid water to form hydrogen gas according to the equation 2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g) Wha

just olya [345]

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Explanation:

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4 years ago

How many moles of water are in 0.340 g of water?

anastassius [24]

Answer: 0.018 recurring?

Explanation:

moles = mass/mr

H20 = 2 + 16 = 18

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6 0

3 years ago

PLEASE HELP IM GOING TO GIVE BRAINLY AND A LOT OF POINTS

Goshia [24]

Answer:

a- 0.10 mol

b- 0.078 mol

c- 5454.54 mol

d- 0.160 mol

e- 0.022 mol

a) 3.6 g

b) 14.9 g

c) 5.6 g

d) 39.9 kg

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3 years ago

Is the chemical equation balanced? <br> Zn + 2HCl → ZnCl2 + H2 <br><br> no, or yes

tamaranim1 [39]

Answer:

Yes.

General Formulas and Concepts:

<u>Chemistry - Stoichiometry</u>

Balancing reactions
Reaction prediction

Explanation:

Zn + HCl → ZnCl₂ + H₂

<u>Step 2: Balance RxN</u>

Zn + 2HCl → ZnCl₂ + H₂

Need 2 H's on both sides
Need equal amount of Cl's on both sides

3 0

3 years ago