Based on..
Saying 7 grams of yeast is 1.75 teaspoons, then 1 pound is 453.6 grammes, so 1 pound of yeast is 113.4 teaspoons
In the US, the 0.25 oz packets of yeast are about 2 1/4 tsp each. That means there are 64 packets in 1 lb, or 144 US teaspoons.
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30 minute searching the net gave me the answer of 4.4 grams per tsp.
This above answer is correct, but only if you are using dried granular yeast.