Answer:
8.4/3.1 =2.709
Explanation: density is mass divided by volume
The Henderson-hasselbalch equation for a propanoic acid solution is expressed as [A-]/[HA] = 2.7.
<h3>What is
Henderson H
asselbalch Equation ?</h3>
It is expressed as:
pH = pKa + log([A-]/[HA].
where,
[A-] is molar concentration of conjugate base and
[HA] is molar concentration of weak acid.
Given,
pH = 5.30
Substitute the value in the Henderson Hasselbalch equation
5.30 = 4.874 + log[A-]/ [HA]
log[A-]/[HA] = 5.30 - 4.874
[A-]/[HA] = 10^ 0.426
[A-]/[HA] = 2.7
Thus from the conclusion we can say that The henderson-hasselbalch equation for a propanoic acid solution is expressed as [A-]/[HA] = 2.7.
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Heavy rainfall causes a landslide. Hence, option A is correct.
<h3>What is a landslide?</h3>
A landslide is defined as the movement of a mass of rock, debris, or earth down a slope.
Water can trigger landslides and mudslides because it alters the pressure within the slope, which leads to slope instability.
Consequently, the heavy water-laden slope materials (soil, rock, etc.) will succumb to the forces of gravity.
Hence, option A is correct.
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Answer:
11.2g of the 45% pure silver and 2.8g of the 50% pure silver.
Explanation:
14g of 46% pure silver contains:
14g*46% = 6.44g of silver are required. Thus, we can write:
6.44 = X*50% + Y*45% <em>(1)</em>
<em>Where X is the mass of 50% pure silver and Y the mass of 45% pure silver.</em>
<em />
As the mass of the sample must be 14g:
14g = X + Y <em>(2)</em>
<em></em>
Replacing (2) in (1):
6.44 = (14-Y)*50% + Y*45%
6.44 = 7 - 0.5Y + 0.45Y
-0.56 = -0.05Y
Y = 11.2g of the 45% pure silver
And:
14g-11.2g = X
X =
2.8g of the 50% pure silver