Answer:
1. balance observation using "how much" = 5. quantitative instrument
2. graduated cylinder = 4. quantitaive instrument of volume
3. hypothesis proposed explanation= 7. qualitative descriptive observation
4. unit of volume= L
6. kg = primary unit of mass
Explanation:
there seem to be some typo error in uploading question but still it was clear to answer.
Answer:
4
Explanation:
the zeros after 102,4 are not significant.
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Answer:
We need 4.28 grams of sodium formate
Explanation:
<u>Step 1:</u> Data given
MW of sodium formate = 68.01 g/mol
Volume of 0.42 mol/L formic acid = 150 mL = 0.150 L
pH = 3.74
Ka = 0.00018
<u>Step 2:</u> Calculate [base)
3.74 = -log(0.00018) + log [base]/[acid]
0 = log [base]/[acid]
0 = log [base] / 0.42
10^0 = 1 = [base]/0.42 M
[base] = 0.42 M
<u>Step 3:</u> Calculate moles of sodium formate:
Moles sodium formate = molarity * volume
Moles of sodium formate = 0.42 M * 0.150 L = 0.063 moles
<u>Step 4:</u> Calculate mass of sodium formate:
Mass sodium formate = moles sodium formate * Molar mass sodium formate
Mass sodium formate = 0.063 mol * 68.01 g/mol
Mass sodium formate = 4.28 grams
We need 4.28 grams of sodium formate
Answer:
V₂= 33581.4 ft³
Explanation:
Given data:
Initial temperature = -15 °C (-15+273 = 258 k)
Initial volume = 28500 ft³
Final temperature = 31 °C (31+273 = 304)
Final volume = ?
Solution:
According to the Charles's law
Temperature and volume are directly related to each other.
V₁/T₁ = V₂/T₂
V₂ = V₁×T₂ /T₁
V₂ = 28500 ft³ × 304 k / 258 k
V₂ = 8664000 ft³.k/ 258 k
V₂= 33581.4 ft³
