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erma4kov [3.2K]
2 years ago
6

How many molecules are in 7 g of H2O

Chemistry
2 answers:
SOVA2 [1]2 years ago
8 0

Answer:

2.342*10^23

Explanation:

# of molecules = Moles * NA

# of molecules = (Mass in grams) / (Molar Mass) * NA

Molar Mass of H2O = 18g/mol

Avogadro's number(NA) = 6.022*10^23

Now,

# of molecules = (7g/18gmol)*(6.022*10^23) = 2.342 * 10^23

Luda [366]2 years ago
5 0

Answer:

0.38

Explanation:its right bc it is

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Describe the relationship between the radius of a cation and that of the atom from which forms.
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3 years ago
Convert 16.8 L of nitrogen monoxide gas at STP to grams .
german

Answer:

See explanation

Explanation:

1 mole of a gas occupies 22.4 L

x moles occupies 16.8 L

x = 1 mole *  16.8 L/22.4 L

x = 0.75 moles

number of moles = mass/molar mass

mass =  number of moles  * molar mass

mass =  0.75 moles * 30.01 g/mol = 22.5075 g = 2.25 * 10^1 g

the coefficient of the scientific notation answer = 2.25

the exponent of the scientific notation answer = 1

significant figures are there in the answer = 6

the right most significant figure in the answer = 3

2.

number of moles = 12.5g/38g/mol = 0.3289 moles

1 mole occupies 22.4 L

0.3289 moles occupies 0.3289 moles * 22.4 L/1 mole

= 7.36736 L = 7.36736 * 10^0 L= 7.37 * 10^0 L

the coefficient of the scientific notation answer =7.37

the exponent of the scientific notation answer = 0

significant figures are there in the answer = 6

the right most significant figure in the answer= 3

8 0
3 years ago
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