Answer:
Q ≈ 1 x 10⁵ joules (1 sig. fig. based on 50g sample given)
Explanation:
Three heat transitions need be considered. Cooling the steam to 100°C, condensing the steam to water and cooling the water from 100°C to 87°C.
Total Heat exchange (Q) = ∑ heat transitions
Q = (m·c·ΔT)steam + (m·ΔH)condensation + (m·c·ΔT)water cooling
= (50g x 0.48j/g·°C x 14°C) + (50g x 2259j/g) + (50g x 4.184j/g·°C)
= 24j + 112,950j + 209.2j
= 113,183.2j ≈ 1 x 10⁵ joules (1 sig. fig. based on 50g sample given)
ANSWER:
0.94 cm
EXPLANATION
From the question,
This implies that,
But volume is given by the relation;
Substituting equation 2 into equataion 1 and making d the subject.
Multiplying both side of the equation by
gives;
square root both sides gives;
substituting the values of M,V,D and l into equation 4 to get the value for d
Hence the diameter of the object is 0.94 cm
When molecular hydrogen<span> </span><span>and </span>oxygen<span> </span><span>are combined and allowed to react together, energy is released and the molecules of </span>hydrogen and oxygen<span>can combine to </span>form<span> either </span>water<span> or </span>hydrogen<span>peroxide.</span>