Using the correct number of significant figures, calculate the mass of an object with a volume of 3.4 cm^3 and a density of 26.34 g/cm^3.

Which describes interactions between substances and stomata during photosynthesis? check all that apply. oxygen enters stomata. oxygen is released through stomata. carbon dioxide enters stomata. carbon dioxide is released through stomata. hydrogen enters stomata. hydrogen is released through stomata.

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.