Answer:
31.9178 °C is the final temperature of the water
Explanation:
Mass of benzene burned = 6.200 g
Moles of benzene burned =
According to reaction , 2 moles of benzene gives 6542 kJ of energy on combustion.
Then 0.0794 mol of benzene on combustion will give:
Mass of water in which Q heat is added = m = 5691 g
Initial temperature =
Final temperature =
Specific heat of water = c = 4.18 J/g°C
Change in temperature of water =
31.9178 °C is the final temperature of the water
Answer:
2. genes, located on chromosomes, found in the nucleus
Explanation:
Traits passed from parents to offspring are determined by gene characteristic and is usually made up of more than one gene. Traits can either be inherited or as a result of new gene mutation. Chromosomes are found in the nucleus and contain hundreds to thousands of genes arranged in a particular sequence.
The cell nucleus contains 23 pairs of chromosomes making a total of 46 chromosomes.
Answer:
0.4912 kJ/K
Explanation:
Using steam table, the properties of water at stage 1 can be determined:
= 400 kPa
= 60°C
Therefore, from steam table:
specific volume
entropy
Calculating the specific volume of water after the partition is removed, since the mass is constant and volume of water is doubled:
Final pressure of water in the tank =
dryness factor after removing the partition
Therefore:
Thus, the entropy change is:
Δs =
Therefore, the entropy change of water is 0.4912 kJ/K
Answer:
Covalent bonding occurs when atoms share valence electrons to form a chemical bond. Atoms of nonmetals form covalent bonds by sharing electrons in order to achieve an octet of valence electrons, like the noble gases, except for helium, which only has two valence electrons. The octet refers to the highest energy s and p sublevels, the valence shell, which in noble gases, except for helium, are filled with eight electrons, two in the s sublevel and six in the p sublevel.
In order to calculate the percentage of a substance (sucrose this time) in a sample of known mass, the mass of the substance needs to be determined first.
The mass of a substance can be determined from its number of moles and molar mass, such that:
mass = mole x molar mass
Once the mass of the substance is determined, the percentage of the substance in 20.0 g sample can be calculated as:
Percentage of substance = mass of substance/mass of sample x 100
Hence, assuming that the mass of sucrose is x g:
percentage of sucrose in the sample = x/20 X 100
= 5x %
More on percentage calculation can be found here: brainly.com/question/12616082