Recent content by axer

Homework Statement The average pressure of the blood in a person’s arteries is 100 mmHg. What is the average pressure in an artery in the head of standing person 40 cm above the heart? (blood density= 1.05x103 kg/m3,Mercury density = 13.6x103 kg/m3 and g=10 m/s2) Homework EquationsThe...

so V=1.2*10-14/1.6*10-19 V= 75.000 V Oh, wait is it actually 75,000... this apply to all questions when given eV and asked to find V. Thanks both!

Ok i see.. so 1 eV= 1.6*10-19 J 75 keV = 1.6*10-19 (75000) = 1.2*10-14 J. this is the energy in Joule of an electron with an energy of 75 keV. If right.. How do I use it to find V? If I am being wrong/confusing, would you please show me the answer so I can find where I am thinking wrong...

Thanks, so by my understand of your reply, 1 eV = (1.6*10-19) (1 V) So if we had 75,000 eV, then the potential difference is also 75,000. Answer: 75,000 V. Right?

Thanks for your quick reply, in the question the potential difference was not given and must be calculated. IIm just confused why you said pd of 75keV. Thanks

Homework Statement If the electrons hit the tungsten target with an energy of 75 keV, find the potential difference. Homework EquationsThe Attempt at a Solution I tried this: (W=eV) V=W/Q V=eV/Q V=75,000/1.6*10-19 V= 4.6*1023 V, This seems wrong because all examples in my...

5-methylheptane1,4-diol. I couldn't find where can I start learning this organic compound? I don't have access to any books to refer to so I'm wondering which lesson can I find this compound as an example? And I've never seen a compound with a diol. Thanks

Oh by using the ideal gas law, ok thanks!

So 5517.4 moles is the correct number of moles? since they didn't specify the temp.

Homework Statement Based on your understanding of Avogadro's law. 1000 L steel storage tank contains 88.5 kg of methane gas, CH4. Calculate no. of moles. The Attempt at a Solution one method= no. of moles=mass/molar mass. no. of moles= 88500/16.04= 5517.4 moles.other method= 1 mol= 22.4 liter...

2*6.02×1023 the question included no of moles

Oh.. so the number of molecules is just no. of moles times molar mass? no need to multiply by 2?

Homework Statement After balancing an equation, there are 1.82 moles of O2. Calculate the number of molecules of O2. given moles. Homework EquationsThe Attempt at a Solution in every O2 molecule, there are 2 moles of O. so if the number of moles of O2 molecule is 1.82. then 1.82*2= 3.65...

Thank you, My teacher gave us the recipe. i just wanted to check the mass number.

Homework Statement Describe how one would make a 100 mL solution of 0.1 M H2O2? Homework EquationsThe Attempt at a Solution to get no. of moles = ml*M/1000 100*0.1/1000= 0.01 moles h202. mass= 0.01*34= 0.34 g. Correct?