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Sergio [31]
3 years ago
8

Number 7 and 8 Skjsjsjsjskksksksksksksjjsj​

Chemistry
2 answers:
wel3 years ago
8 0

Answer: B. foe both g

Explanation:

noname [10]3 years ago
3 0

Answer:

B

B

Explanation:

the both have the same thing or something

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How do you know a physical change has occurred when evaporating water produces gaseous water?
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How do the atomic number and the mass number of an element
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1. The electron configuration below represents the ground state of an atom.
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4 0
2 years ago
What is the percent by mass of nahco3 in a solution containing 10 g of nahco3 dissolved in 400 ml of h2o?
Marat540 [252]
Answer is: the percent by mass of NaHCO₃ is 2,43%.
m(NaHCO₃) = 10 g.
V(H₂O) = 400 ml.
d(H₂O) = 1 g/ml.
m(H₂O) = V(H₂O) · d(H₂O).
m(H₂O) = 400 ml · 1 g/ml.
m(H₂O) = 400 g.
m(solution) = m(H₂O) + m(NaHCO₃).
m(solution) = 400 g + 10 g.
m(solution) = 410 g.
ω(NaHCO₃) = 10 g ÷ 410 g · 100%.
ω(NaHCO₃) = 2,43 %
7 0
3 years ago
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