Is nh4co3 soluble in water?

Ineed to find the answer of this question because i dont understand it

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Use the measurements in the table to determine which unidentified metal has the highest density. metal volume mass a 10.5 cm3 122 g b 14.2 cm3 132 g c 16.1 cm3 115 g d 12.7 cm3 126 g