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Colt1911 [192]
3 years ago
5

How many atoms of calcium are in 8.4 moles of calcium? ​

Chemistry
1 answer:
QveST [7]3 years ago
8 0

6.024 ×1022 Ca  \:  \: atoms

please mark me brainliest please

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Choose the substance with the lowest boiling point.
MA_775_DIABLO [31]

Answer:

E. O2

Explanation:

All substances has a simple molecular structure, where between their molecules are held by van der Waals' forces. But C must be incorrect because between the H2O2 molecules, they are mainly held by hydrogen bonds on top of van der Waals' forces. Hydrogen bonds are stronger than van der Waals' forces, so more energy is required to separate the H2O2 molecules.

In structures A and D, the molecules are polar. Their van der Waals' forces are stronger than Cl2H2 and O2, which are non-polar.

Between the Cl2H2 and O2, O2 has a smaller molecular size. The van der Waals' forces between the O2 molecules are hence the weakest. Least amount of energy is required to break the intermolecular forces between the O2 molecules therefore it has the lowest boiling point.

8 0
3 years ago
Does indium react with acid?
Zinaida [17]
Yes it will react with acid.
4 0
3 years ago
When an aqueous solution of magnesium nitrate is mixed with an aqueous solution of potassium carbonat?
vodka [1.7K]
Chemical eqn
Mg(NO3)2 + K2CO3 ----> MgCO3 + 2KNO3
4 0
3 years ago
Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. Suppose 2.1 grams of ethane i
swat32

Answer:

= 3.78 g H₂O

Explanation:

2C₂H₆ + 3O₂ => 4CO₂ + 6H₂O

2.1g C₂H₆ = 2.1g/30.0 g/mol = 0.07 mole ethane

3.68g O₂ = 3.68g/32 g/mol = 0.115 mole oxygen

Limiting Reactant:

A quick way to determine limiting reactant is to divide moles of reactant by its respective coefficient in the balanced molecular equation. The smaller value is the limiting reactant.

moles ethane = 0.07 mole / 2 (the coefficient in balanced equation) = 0.035

moles oxygen = 0.115 mole / 3 (the coefficient in balanced equation) = 0.038

Since the smaller value is associated with ethane, then ethane is the limiting reactant and the problem is worked from the 0.07 moles of ethane in an excess of O₂.

From the equation stoichiometry ...

2 moles C₂H₆  in an excess of O₂ => 6 moles H₂O

then 0.07 mole C₂H₆  in an excess of O₂ => 6/2(0.07 moles H₂O = 0.21 mole

Converting to grams of water produced

= 0.21 mole H₂O X 18 g/mol = 3.78 g H₂O

8 0
4 years ago
(I ONLY HAVE 15 MIN LEFT IN MY TEST PLEASE HELP ME!!)
zloy xaker [14]

Answer:

183g

Explanation:

mass can't be created or destroyed so i think you just add up the total amounts of matter

8 0
3 years ago
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