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GaryK [48]
2 years ago
15

Which of the following best defines Avogadro's number? (5 points)

Chemistry
2 answers:
qaws [65]2 years ago
4 0

Answer:

Number of particles in exactly one mole of a substance.

Explanation:

Avogardo's number is used as a constant to determine how many atoms, or subatomic particles, are in an element. We use it only when determining atoms, molar mass has its own equation.

Likurg_2 [28]2 years ago
3 0

Answer:

Avogadro's number is 6.022* 10^23

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Sydney and Valparaiso are the same distance from the equator and both are near the ocean. Is Valparaiso warmer, colder, or the s
PilotLPTM [1.2K]

Answer: It's colder.

Explanation: Well for starters Valparaiso is further away from the equator, and Australia is already really hot. But say that Valparaiso is further from the equator should be good enough.

5 0
3 years ago
Read 2 more answers
What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.
AlekseyPX

Answer:

The pH value of the mixture will be 7.00

Explanation:

Mono and disodium hydrogen phosphate mixture act as a buffer to maintain pH value around 7. Henderson–Hasselbalch equation is used to determine the pH value of a buffer mixture, which is mathematically expressed as,

pH=pK_{a} + log(\frac{[Base]}{[Acid]})

According to the given conditions, the equation will become as follow

pH=pK_{a} + log(\frac{[Na_{2}HPO_{4} ]}{[NaH_{2}PO_{4}]})

The base and acid are assigned by observing the pKa values of both the compounds; smaller value means more acidic. NaH₂PO₄ has a pKa value of 6.86, while Na₂HPO₄ has a pKa value of 12.32 (not given, but it's a constant). Another more easy way is to the count the acidic hydrogen in the molecular formula; the compound with more acidic hydrogens will be assigned acidic and vice versa.

Placing all the given data we obtain,

pH=6.86 + log(\frac{0.058}{0.042})

pH=7.00

5 0
3 years ago
What is volume? What instrument is used to measure liquid volume? What formula is used to calculate the volume of a solid object
sertanlavr [38]

Answer:

Volume is the amount of space that a substance occupies. A graduated cylinder is used to measure liquid volume. The formula used to calculate the volume of a solid object is = L x W x H

Explanation:

8 0
2 years ago
Aluminium is a metal give reason​
trapecia [35]

Answer:

Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.

7 0
3 years ago
Given the reaction: 3() + () → 3() + 2()
Scilla [17]

Answer:

i think d is the answer for this

3 0
2 years ago
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