The weight of 16.3 moles of nickel amounts to 956.647 g.
Answer:
There are 5.5668 moles of water for every mole of CuSO₄.
Explanation:
The mass of anhydrous CuSO₄ is:
23.403g - 22.652g = 0.751g.
mass of crucible + lid + CuSO₄ - mass of crucible + lid
Given that the molar mass of CuSO₄ is 159.609g/mol, we calculate the moles:
0.751g ×
= 4.7052x10⁻³ moles CuSO₄
The mass of water in the initial sample is:
23.875g - 0.751g - 22.652g = 0.472g.
mass of crucible + lid + CuSO₄ hydrate - CuSO₄ - mass of crucible + lid
As the molar mass of H₂O is 18.02g/mol, we find the moles:
0.472g ×
= 2.6193x10⁻² moles H₂O
The mole ratio of H₂O to CuSO₄ is:
2.6193x10⁻² moles H₂O / 4.7052x10⁻³ moles CuSO₄ = 5.5668
This indicates there are 5.5668 moles of water per mole of CuSO₄.
I hope this is helpful!
An r-selected species has a significantly faster reproductive rate compared to K-selected species.
The focus of r-selected species is on quick maturation and reproduction. They are likely to breed during short periods when water supply is available, thus enhancing their survival chances.
Conversely, K-selected species prioritize nurturing their young and tend to reproduce later. Due to the longer maturation time before breeding, by the time K-selected species are ready, the water supply may be depleted, leading to lower survival odds.
Hope this clarifies!
If you have more questions, don’t hesitate to ask! Have a fantastic day!:)
~Collinjun0827, Junior Moderator
Answer: 25,200.
Explanation:
1) Starting with: 4.659 × 10⁴ - 2.14 × 10⁴
2) Significant figures need to be considered.
Because the powers are equal (10⁴), the decimal values can be subtracted directly. However, it is essential to first check significant figures and the count of decimal places.
3) The figure 4.659 × 10⁴ has four significant digits (4, 6, 5, and 9), whereas 2.14 × 10⁴ contains three significant digits (2, 1, and 4).
4) When adding or subtracting values with a different number of decimal places, the answer must reflect the same number of decimal places as the number with the least amount of decimal precision.
5) Prior to performing subtraction, it is necessary to round the numbers to the least decimal places. Given that 2.14 has two decimal places and 4.659 has three, round 4.659 to 4.66.
6) Now perform the subtraction 4.66 - 2.14 = 2.52
7) Then multiply by the power of 10: 2.52 × 10⁴ = 25,200. This is the final answer.
