Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_2780146_6 (no_x__g_kwh_ VARCHAR, hc__g_kwh_ VARCHAR)
### Question:
What's the NO of the standard with HC of 1.23 g/kWh?
### Answer:
SELECT no_x__g_kwh_ FROM table_2780146_6 WHERE hc__g_kwh_ = "1.23"