How many grams are in 21.3 moles of BaCO3

0.108 moles BaCO3

Explanation: You have to divide the moles by the molar mass of BaCO3, which is 197.34. The grams will cancel out, and you're left with 0.108 moles, which has been rounded to 3 sig figs.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock