Categories
Ask Chemistry

How many monochloro products including stereoisomers of the given compound are possible?

I tried solving problems and I got 2 products. However according to my book the answer is 3 products.

Categories
Ask Chemistry

How to calculate planar density of a face /plane of crystal with cation and anions?

Planar density is given by numer of atoms in plane /plane area . Suppose I want to calculate planar density of 100, 101 and 111 planes of Nacl. Radius of Na+ and Cl- ions is 0.086 nm and 0.126 nm.Na+ are present at octahedral voids and cl- at FCC but the problem which I am […]

Categories
Ask Chemistry

How does this rotation minimize the dipole moment?

A paper I’m reading says: The low energy conformation of 3 minimizes the overall dipole moment of the compound and thus rotates the exocyclic amide 180° from desired conformation, as can been seen in structure 4. Why does this rotation minimize the overall dipole moment?

Categories
Cryptocurrency Ethereum Mastering Development

Is calling another contract via its address risky?

The below screenshot is from Andreas’ book. I don’t understand why this programming technique is so risky. See the text in the red block in the image. We have the .sol file, and the Bytecode on the Blockchain at the contract address is immutable. Can’t we verify that the Contract Bytecode matches the Bytecode generated […]

Categories
Linux Mastering Development

In a renote shell, how can I find out from which computer I logged into the remote machine?

In a remote shell, how can I find the domain name of the computer from which I logged into the remote machine? Example: My local machine is mi.pona.com. On this machine I run ssh toki@sina.pona.com to login into the remote machine sina.pona.com. In the shell which opens (running on the remote machine) I want to […]

Categories
Linux Mastering Development

RHEL 8 install.log – where I can find this file?

Where I can find this file titled : install.log , it is usually located in the root directory /root , but since release 8 it has been moved to other location. It is contains information about the installation as proceeded.

Categories
Linux Mastering Development

Checking if tar file exists | bash script

I am trying to test if the tar file I am about to create already exists. If it doesn’t then I want to create the tar file (this part of the code works). However the if statement testing if that file name for the tar file exists, doesn’t work (doesn’t actually test if the tar […]

Categories
Mastering Development

why my google app QUERY formula does not work?

This is the original query: QUERY(IMPORTRANGE("sheet_name", "Social media posts!A:AS"),"SELECT Col1, Col14, Col12, Col10, Col23, Col16, Col13, Col37, Col2, Col3 WHERE Col2=’instagram’") Output of the original query. Please check column H, which has empty cells. I was trying to subquery the original query with this script: =QUERY(QUERY(IMPORTRANGE("sheet_name", "Social media posts!A:AS"),"SELECT Col1, Col14, Col12, Col10, Col23, Col16, […]

Categories
Mastering Development

Apple Picking Optimization Algorithm

I found these problem: Suppose that I have fields with N apple tree, each with Ai apple on it. I also have M basket, each basket have the property Ci for capacity and Fi for flexibility. When I’m going to pick the apple trees I can only pick from tree in order from 1 to […]

Categories
Mastering Development

c# openxml datatable exported to excel causes repair when used in spreadsheet comparer utility in windows 10 office 2019

no repair issue when I open in excel application only spreadsheetcomparer complains for read past stream error messgae spreadsheetcomparer has anyone faced this issue earlier what we can do for it to fix from openxml library perspective edit1 I will try to give more detail, When I compare repaired and non repaired excel winmerge says […]