80g of calcium reacts with water to form 114g of calcium hydroxide and 2g of hydrogen.
2 Ca + 2 H0+2CaOH + H,
What mass of water was used in this reaction?

31g

Explanation:

80g(Ca)+m(H2O)=114g(CaOH)+2g(H2)

the total mass of the prodicts doesn't change throughout the process

80g+m(H20)=116g

m(H20)=31g

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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