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Zinaida [17]
3 years ago
15

Please help me with

Chemistry
1 answer:
kkurt [141]3 years ago
5 0

Answer:

which one?

Explanation:

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What is the number of known elements?
olga2289 [7]

Answer:

the answer Is 115

Explanation:

there is no explanation

6 0
4 years ago
A common cooking vinegar is 5.0% acetic acid (ch3cooh. how many molecules of acetic acid are present in 41.9 g vinegar?
UkoKoshka [18]
To calculate the number of molecules ch3cooh in a given amount of vinegar, we first need to determine the amount of ch3cooh in the solution by multiplying the percent <span>ch3cooh with the sample amount. Then, convert g to moles and use avogadro's number. We do as follows:

41.9 g vinegar solution ( .05 g </span><span>ch3cooh / g vinegar solution ) (1 mol / 60.05 g ) ( 6.022x10^23 g / 1 mol ) = 2.1x10^22 molecules </span><span>ch3cooh</span>
6 0
3 years ago
Which of the following is an example of a change of state?
lord [1]

Answer:

Option B

Explanation:

  • For Option A the state is not changing but just has different look now.
  • For Option B the state is changing from gas to liquid drops due to cold glass
  • For Option C it hasn't changed state as both corn and flower is solid
  • For Option D paper and ash are both solids

Therefore our answer must be Option B

6 0
2 years ago
Why does a human body need proteins?
Sophie [7]
I’m pretty sure the answer would be B.
5 0
4 years ago
How many atoms are contained in 3.46 moles of magnesium
Liono4ka [1.6K]

Answer:

2.08 * 10^{24}

Explanation:

Avagadros number times the # of moles.

6 0
3 years ago
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