When carbon is burned in air carbon iv oxide gas is formed.
C (s) + O2 (g) = CO2(g) ΔH = - 393.5 kj/mol
The enthalpy change of the reaction is -393.5 j/mol which means that when one mole of carbon is completely burnt in air then 393.5 j of energy is evolved.
Thus, 1 mole = -393.5 j , then for 480 kj
= 480 × 1/393.5
= 1.2198 moles
1 mole of carbon iv oxide is equal to 44 g
thus, 1.2198 moles will be 1.2198 × 44 = 53.6712 g of CO2
Answer:
Option (A). The mass of the rusted nail equals the mass of iron and the oxygen from the air it reacted with to form the rust.
Minerals form by erosion of rocks.The erosion process includes water and other rocks rubbing against other rocks.
Answer:
What best describes how light is produced is transmit & scatter light
Answer:
The 264.61 g food will contain 2150 calories.
Explanation:
Given data:
mass of food = 16 g
calories in 16 g of food = 130 cal
grams of 2150 calories = ?
Solution:
we will solve this problem by cross multiplying.
16 g/ 130 cal = x/2150 cal
x = (16 g/130 cal) × 2150 cal
x = 0.123 g × 2150
x= 264.61 g
so the 264.61 g food will contain 2150 calories.
