Does this USB-C hub support charging while connected, and how much power can it pass through?

Yes. It supports USB Power Delivery pass-through with up to 100W input, depending on the host and charger being used.

How many USB-C ports does this hub have, and what are they used for?

It has 4 USB-C ports total: 3 USB 3.2 Type-C Gen 2 ports for data only, and 1 USB 3.2 Gen 2 Type-C port that supports both data and USB Power Delivery.

Questions & Answers: StarTech 4-Port USB-C Hub - 10Gbps - 100W PD Charging - 4x USB-C Ports - Overcurrent Protection - PCR Aluminum - For Laptop/Tablet - 309B-USBC-HUB

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Item#: N82E16817707528
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StarTech 4-Port USB-C Hub - 10Gbps - 100W PD Charging - 4x USB-C Ports - Overcurrent Protection - PCR Aluminum - For Laptop/Tablet - 309B-USBC-HUB

4x USB-C: 3x USB 3.2 Type-C Gen 2 10Gbps (data only); 1x USB 3.2 Gen 2 Type-C 10Gbps Power Delivery + Data. Host connector: 1x USB 3.2 Type-C Gen 2 10Gbps
USB 3.2 Gen 2 (10Gbps); USB Power Delivery (100W PD pass-through)

$41^.99 –