Answer:
43.47 g
Explanation:
The <em>boiling point elevation</em> is described as:
Where ΔT is the difference in boiling points: 120.6-118.4 = 2.2 °C
K is the boiling point elevation constant, K= 2.40 °C·kg·mol⁻¹
and m is the molality of the solution (molality = mol solute/kg solvent).
So first we <u>calculate the molality of the solution</u>:
- 2.2 °C = 2.40 °C·kg·mol⁻¹ * m
Now we calculate the moles of benzamide (C₇H₇NO, MW=315g/mol), using the given mass of the liquid X.
- 150 g ⇒ 150/1000 = 0.150 kg
- 0.917 m = molC₇H₇NO / 0.150kg
Finally we convert moles of C₇H₇NO into grams, using its molecular weight:
- 0.138 molC₇H₇NO * 315g/mol = 43.47 g
Answer:
Explanation:
A binary molecular compound is a molecular compound that is composed of two elements. In general, the elements that combine to form binary molecular compounds are both nonmetals. This contrasts with ionic compounds, which usually involve bonds between metal ions and nonmetal ions.
Answer:
Cathode rays are streams of electrons observed in discharge tubes. In 1897, British physicist J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron. Cathode-ray tubes (CRTs) use a focused beam of electrons deflected by electric or magnetic fields to render an image on a screen.
Answer:
1. atomic #
2.The sugar-water is a homogeneous mixture
Explanation:
1. However, if it has positive ion, then this electron number will go down (ie +2 charge means two electrons have been lost, so the electron/atomic number will go down by two) and vice versa.
2.Sugar dissolves and is spread throughout the glass of water. The sand sinks to the bottom. The sugar-water is a homogenous mixture while the sand-water is a heterogeneous mixture. Both are mixtures, but only the sugar-water can also be called a solution.
Balanced equation:
2 moles of Al react with 6 moles of HCl. 2 moles of AlCl₃ and 3 moles of H₂ are produced.
The answer is C.