Specific heat refers to the quantity of heat a material can absorb or release to alter its temperature by one degree Celsius. To calculate specific heat, we apply the equation for the heat absorbed by the system. The heat taken in or released by a system can be expressed by multiplying the mass of the substance by its specific heat capacity and the change in temperature. The formula is:
Heat = mC(T2-T1)
By substituting the provided values, we can find C, the specific heat of the substance.
2510 J = 0.158 kg (1000 g / 1 kg)(C)(61.0 - 32.0 °C) C = 0.5478 J/g°C
Answer:
Central metal oxidation state: +2
Coordination number: 6
Overall charge: -2
Explanation:
For the ion complex:
Na₂[Cr(NH₃)₂(NCS)₄]
The central metal is chromium, with NH₃ and NCS as the ligands.
NH₃ acts as a neutral ligand, while NCS carries a negative charge.
The entire complex has a charge of:
2Na⁺ + [Cr(NH₃)₂(NCS)₄]⁻² → -2
Since each NCS contributes -1 and there are four NCS, the Cr must possess an oxidation state of +2 to achieve an overall charge of -2.
With 2 NH₃ and 4 NCS attached, the coordination number sums to 2+4 = 6
I trust this clarifies the matter!
The calculation of moles of chromium (III) nitrate produced is done as follows. First, you write the reaction equation: 3 Pb(NO3)2 + 2 Cr = 2 Cr(NO3)3 + 3 Pb. Then, by using the mole ratio from Pb(NO3)2 to Cr(NO3)3, which is 3 to 2, you can find the moles of Cr(NO3)3. Thus, for 0.85 moles of lead (IV) nitrate, it equates to 0.85 x 2 / 3 = 0.57 moles.
Answer:
B 1.0 g
Explanation:
Greetings,
Upon analyzing the significant figures, it's evident that 1 g has merely one significant figure. Consequently, among the provided choices, we should go with the one that closely matches this, hence the right answer is B 1.0 g since this measurement fits the required value.
Best wishes.
The correct answer is C: 2.0 mL. This is due to the precision of the burette, which measures liquid volumes accurately with a precision of ±0.01 mL, indicating that it can reliably measure volumes around 2 mL without issue.
