First of all, it's not called alimony, it's called spousal support. 10 years is considered a long-term marriage, and there's a general rule that someone is entitled to spousal support when in a long-term marrriage, but it's a fact-dependent analysis with plenty of exceptions that depends on the entire situation, including the spouse's respective ages, education, actual earnings and earning potential, etc., etc.
See a guide like the one linked below if you want to try to DIY. Better yet, see a family lawyer for help. especially if you're dealing with both spousal and child support issues.
Disclaimer: Please note that this answer does not constitute legal advice, and should not be relied on, since each state has different laws, each situation is fact specific, and it is impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue. This answer does not create an attorney-client relationship.
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