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sasho [114]
3 years ago
8

Which kind of investigations allow for the control of variables?

Chemistry
2 answers:
KATRIN_1 [288]3 years ago
6 0

Answer: The answer would be B. Hope this helps.

Explanation:

Monica [59]3 years ago
4 0

Answer:

b

Explanation:

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How many phosphorus atoms are contained in 158 kg of phosphorus? how many phosphorus atoms are contained in 158 kg of phosphorus
zheka24 [161]
To determine the number of phosphorus atoms from a given mass, we need to determine the number of moles of the substance by dividing the molar mass which for in this case is equal to 123.88 g/mol for P4. Then, we multiply Avogadro's number. It <span>represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole.

mole P4 = 158 kg P4 ( 1000 g / 1 kg ) ( 1 mol / 123.88 g ) = 1275.43 mol P4
# of P4 atoms = 1275.43 mol P4 ( 6.022 x 10^23 atoms P4 / 1 mol P4 ) = 7.68x10^26 atoms P4</span>
4 0
4 years ago
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Answer:

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Explanation:

everthing has to be at a complete stop then through energy be moved

7 0
3 years ago
Which of the following pair has a larger size? a)K or K- b)Br or Br- c)O2- or F- d) Li or Na​
Anna11 [10]

Answer:

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3 years ago
The solubility of Z is 60 g/ 100 g water at 20 °C. How many grams of solution are produced when a saturated solution is prepared
V125BC [204]

Answer:

Saturated solution = 180 gram

Explanation:

Given:

Solubility of Z = 60 g / 100 g water

Given temperature =  20°C

Amount of water = 300 grams

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Saturated solution

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Saturated solution = [Solubility of Z] × Amount of water

Saturated solution = [60 g / 100 g] × 300 grams

Saturated solution = [0.6] × 300 grams

Saturated solution = 180 gram

3 0
3 years ago
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GenaCL600 [577]

Answer:

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Explanation:

3 0
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