Answer:
Mass = 0.610 g
Explanation:
Given data:
Mass of Na₂SiO₃ = ?
Mass of HF = 0.800 g
Solution:
Chemical equation:
Na₂SiO₃ + 8HF → H₂SiF₆ + 2NaF + 3H₂O
Number of moles of HF:
Number of moles = mass/ molar mass
Number of moles = 0.800 g/ 20 g/mol
Number of moles = 0.04 mol
Now we will compare the moles of HF and Na₂SiO₃.
HF : Na₂SiO₃
8 : 1
0.04 : 1//8×0.04 = 0.005
Mass of Na₂SiO₃:
Mass = number of moles × molar mass
Mass = 0.005 mol × 122.07 g/mol
Mass = 0.610 g
It seems that you have missed the given choices for this question. But anyway, here is the correct answer. The energy of an electromagnetic wave that has a wavelength of 0.035m is 5.68E-24 J. Hope this is the answer you are looking for. Other choices of this question include the following: 2.16E-35 J, 1.14E7 J, and 8.62E9 J. Thanks for posting your question.
Hey there,
Based on my research and my understanding, your correct answer would be exactly 760 torr. Because if you do <span>Pt = P1 + P2 + P2, that will eventaully give your 760 torr.
~Jurgen</span>
I think the best one is B
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