How many grams of potassium oxide are made of 22.4 L of oxygen gas at STP reacts with 39.1 g of potassium?​

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

City a and city b had two different temperatures on a particular day. on that day, four times the temperature of city a was 8â° c more than 3 times the temperature of city b. the temperature of city a minus twice the temperature of city b was â’3â° c. what was the temperature of city a and city b on that day? city a was 5â° c, and city b was 4â° c. city a was 3â° c, and city b was â’1â° c. city a was 8â° c, and city b was â’3â° c. city a was 5â° c, and city b was â’5â° c.

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned