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Harman [31]
2 years ago
9

What is an allotrope?

Chemistry
1 answer:
Lilit [14]2 years ago
3 0
A I think but idrk I just guess sorry if you get it wrong cause of me just be careful I could be wrong
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Bruh i need help and someone just used the last one for points plz help​
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Answer: 5000

Explanation:

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In 450 BCE, Greek philosopher Democritus first thought of the existence
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A. Invisible

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Helppp plzzz will give brainlist
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4. A
because PbCl2 is an ionic compound and it's solid, so it's a substance.
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2 years ago
Which has not been a major source of CFCs
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Answer : Any natural sources of CFC's are not known only the major sources like aerosols, propellants, refrigerants,etc are known. So, if any natural sources are given then it cannot be called as a major source for emitting CFC into environment.

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3 years ago
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An antacid tablet contains 640.0 mg of magnesium oxide per tablet.
Salsk061 [2.6K]

Answer:

317.6 mL

Explanation:

Step 1: Write the balanced neutralization equation

MgO + 2 HCl ⇒ MgCl₂ + H₂O

Step 2: Calculate the mass corresponding to 640.0 mg of MgO

The molar mass of MgO is 40.30 g/mol. The moles corresponding to 640.0 mg (0.6400 g) of MgO are:

0.6400 g × (1 mol/40.30 g) = 0.01588 mol

Step 3: Calculate the moles of HCl that react with 0.01588 moles of MgO

The molar ratio of MgO to HCl is 1:2. The moles of HCl are 2/1 × 0.01588 mol = 0.03176 mol

Step 4: Calculate the volume of 0.1000 M HCl that contains 0.03176 moles

0.03176 mol × (1 L/0.1000 mol) = 0.3176 L = 317.6 mL

3 0
3 years ago
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