Answer:
Explanation:
Graham's law of diffusion states that the rate at which effusion occurs in two gases is equal to the square inverse of each of their molar masses.
Answer: 0.34 mol
Justification:
1) Hepta means 7, so heptahyrate means 7 parts of water. On mole of magnesium sulfate heptadydrate has seven moles of water.
2) The formula of magnesium sulfate heptahydrate is:
Mg SO4 . 7 H2O
3) Calcualte the number of moles of the compound by dividing the mass in grams by the molar mass of formula.
molar mass:
Mg: 24.3 g/mol
S: 32.1 g/mol
O4: 4 * 16.0 g/mol = 64.0 g/mol
H2: 2 * 1.0 g/mol = 2.0 g/mol
O: 16 g/mol
Molar mass = 24.3 g/mol + 32.1 g/mol + 64.0 g/mol + 2.0 g/mol + 16.0 g/mol = 138.4 g/mol
number of moles = mass in grams / molar mass = 6.81 g / 138.4 g/mol = 0.049 mol
4) As stated, there are 7 moles of H2O per each mol of heptahydrate compoind, so the number of moles of water is 7 * 0.049 mol = 0.343 mol
Answer: 0.34 mol
Answer:
The ovaries and the testes
Explanation:
<em>The organs responsible for the development of secondary sex characteristics would be the ovaries and the testes.</em>
<u>Both ovary and testes are associated with the sex organs in the body and are responsible for the synthesis of hormones such as androgen and estrogen. While the latter (estrogen) is produced by the ovary, the former (androgen) is produced by the testes.</u>
More specifically, both androgen and estrogen are hormones responsible for the growth of hairs in areas such as the armpit and the pubic regions of the body.
<em>The correct options are </em><em>the ovaries</em><em> and </em><em>the testes</em><em>.</em>
The question is incomplete, the complete question is; During a conference presentation, a scientist described the materials that she used and how she performed her experiments.
Which best explains why a scientist would share these details in a conference?
It tells the audience if the results support or contradict the hypothesis.
It tells the peers if the study is supported by mathematical models.
It informs the peers if the results are supported by other scientists.
It informs the audience if the study included controlled tests.
Answer:
It informs the audience if the study included controlled tests.
Explanation:
Usually, scientific conferences involve presentation of papers by scientists. These paper presentations are actually the sharing of details of the scientific research carried out by other scientists.
Presenting the materials and methods section of the a research project to a scientific conference informs the audience if the study included controlled tests.
The inclusion of controlled tests in a scientific study enhances the validity of the results obtained in the study.