Calculate the ppm of 40.5 mg calcium in 3.50 grams of pill. O 1.16 x10“ ppm 86.4 ppm O 8.64 x107 ppm O 1.16 x10' ppm O 8.64 x10 ppm

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You are given the following data: H₂(g) 2H (g) Br₂(g) → 2 Br (g) H₂(g) + Br₂(g) 1 kJ mol → → 2 HBr (g) Calculate AH° for the reaction. H(g) + Br(g) HBr (g) Be sure your answer has the correct number of significant digits. x10 ΔΗ° = 436.4 X ΔΗ° = 192.5 ΔΗ° = - 72.4 kJ mol kJ mol kJ mol

How many litres of C6H14(l)C6H14(l), measured at 20 ∘C, must be burned to provide enough heat to warm 26.4 m^3of water from 18.2 to 33.1 ∘C , assuming that all the heat of combustion is transferred to the water, which has a specific heat of 4.18 J g^−1 ∘C? Recall that 1 mL=10−3 L1 mL=10−3 L. Express your answer to four significant figures and include the appropriate units.

s_engine.html?ClassID=1752193328# 19.64 g H2SO4 dissociated in 100.0 g of water in a coffee cup calorimeter. The temperature rose from 23.12 °C to 57.30°C. What is the heat of the reaction, qrxn? H2SO4 → H* + HSO, Csoln = 3.50 J/g °C %3D 9rxn = [ ? ] J Enter either a + or - sign AND the magnitude. q,soln (J) Enter

St + 80. H St heat

2 NO(g) N2(g) + O2(g)   H = -180.7 kJ 2 NO(g) + O2(g) 2 NO2(g)   H = -113.1 kJ 2 N2O(g) 2 N2(g) + O2(g)   H = -163.2 kJ Use Hess's law to calculate H for the reaction below.3 NO(g) N2O(g) + NO2(g)H = _____k J

If 1495 J of heat is needed to raise the temperature of a 357 g sample of a metal from 55.0°C to 66.0°C, what is the specific heat capacity of the metal?______ J/g•°C

Energy cannot be created nor destroyed, but it can be transferred between a system and its surroundings. The change in internal energy, AU, is positive if the system absorbs energy, and it is negative if the system releases energy. (Figure 1) The total change in internal energy is the sum of the heat, q, and work, w: AU=q+w. igure AU Allgyntem >0 Al system ▼ Part A Classify the following by the sign of AU for the system. Drag the appropriate items to their respective bins. If no definitive classification can be made, drag the item into the bin labeled "Not enough data." ▸ View Available Hint(s) Negative The system expands and the surroundings get hotter Submit ✓ Correct Part B Submit Previous Answers AU- Value Provide Feedback Positive μA The system contracts and the surroundings get colder. A gaseous reaction occurs at a constant pressure of 30.0 atm and releases 57.1 kJ of heat. Before the reaction, the volume of the system was 6.80 L. After the reaction, the volume of the system…

A chemist carefully measures the amount of heat needed to raise the temperature of a 399.0 g sample of a pure substance from 4.1 °C to 19.7°C. The experiment shows that 865. J of heat are needed. What can the chemist report for the specific heat capacity of the substance? Round your answer to 3 significant digits. -1 -1 J.g •K x10 Submit Assignme Continue 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center | Accessibili I IMG-6111.jpg IMG-6110.jpg IMG-6109.jpg IMG-6108.jpg IMG-6107.jpg MacBook Air 80 DII DD F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 @ # $ % & 2 3 4 5 6 7 8 9