i'm wondering if it is possible with blockchain to send an amount from 1 address to 100 different addresses?
Many wallets allow you to send different amounts to different addresses all in the same transaction. Bitcoin Core has the "sendmany" command, for example. I use it to fund physical bitcoins and paper wallets (50 at a time). I don't know if its GUI lets you.
If you have access to a qt-wallet, you can do it from the console

sendmany "fromaccount" {"address":amount,...} ( minconf "comment" )
Send multiple times. Amounts are double-precision floating point numbers.
Requires wallet passphrase to be set with walletpassphrase call.
Arguments:
1. "fromaccount" (string, required) The account to send the funds from, can be "" for the default account
2. "amounts" (string, required) A json object with addresses and amounts
{
"address":amount (numeric) The bitcoin address is the key, the numeric amount in btc is the value
,...
}
3. minconf (numeric, optional, default=1) Only use the balance confirmed at least this many times.
4. "comment" (string, optional) A comment
Result:
"transactionid" (string) The transaction id for the send. Only 1 transaction is created regardless of
the number of addresses.
Examples:
Send two amounts to two different addresses:
> bitcoin-cli sendmany "tabby" "{\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XZ\":0.01,\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\":0.02}"
Send two amounts to two different addresses setting the confirmation and comment:
> bitcoin-cli sendmany "tabby" "{\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XZ\":0.01,\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\":0.02}" 6 "testing"
As a json rpc call
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "sendmany", "params": ["tabby", "{\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XZ\":0.01,\"1353tsE8YMTA4EuV7dgUXGjNFf9KpVvKHz\":0.02}", 6, "testing"] }' -H 'content-type: text/plain;'
http://127.0.0.1:8332/(code -1)
